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Flerovium

February 15, 2024

Flerovium is a superheavy synthetic chemical element; it has symbol Fl and atomic number 114. It is an extremely radioactive synthetic element, named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered in 1999. The lab's name, in turn, honours Russian physicist Georgy Flyorov (Флёров in Cyrillic, hence the transliteration of "yo" to "e"). IUPAC adopted the name on 30 May 2012. The name and symbol had previously been proposed for element 102 (nobelium), but was not accepted by IUPAC at that time.

Flerovium, 114Fl
Flerovium
Pronunciation
Mass number[289] (unconfirmed: 290)
Flerovium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Pb
↑
Fl
↓
(Uho)
nihonium ← flerovium → moscovium
Atomic number (Z)114
Groupgroup 14 (carbon group)
Periodperiod 7
Block  p-block
Electron configuration[Rn] 5f14 6d10 7s2 7p2 (predicted)[3]
Electrons per shell2, 8, 18, 32, 32, 18, 4 (predicted)
Physical properties
Phase at STPliquid (predicted)[4]
Melting point284 ± 50 K ​(11 ± 50 °C, ​52 ± 90 °F) (predicted)[4]
Density (near r.t.)11.4 ± 0.3 g/cm3 (predicted)[4]
Heat of vaporization38 kJ/mol (predicted)[5]
Atomic properties
Oxidation states(0), (+1), (+2), (+4), (+6) (predicted)[3][5][6]
Ionization energies
  • 1st: 832.2 kJ/mol (predicted)[7]
  • 2nd: 1600 kJ/mol (predicted)[5]
  • 3rd: 3370 kJ/mol (predicted)[5]
  • (more)
Atomic radiusempirical: 180 pm (predicted)[3][5]
Covalent radius171–177 pm (extrapolated)[8]
Other properties
Natural occurrencesynthetic
CAS Number54085-16-4
History
Namingafter Joint Institute for Nuclear Research (itself named after Georgy Flyorov)[9]
DiscoveryJoint Institute for Nuclear Research (JINR) and Lawrence Livermore National Laboratory (LLNL) (1999)
Isotopes of flerovium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
284Fl synth 2.5 ms[10][11] SF –
285Fl synth 100 ms[12] α 281Cn
286Fl synth 105 ms[13] α55% 282Cn
SF45% –
287Fl synth 360 ms[13] α 283Cn
ε?[14] 287Nh
288Fl synth 653 ms α 284Cn
289Fl synth 2.1 s α 285Cn
290Fl synth 19 s?[15][16] EC 290Nh
α 286Cn
 Category: Flerovium
| references

It is a transactinide in the p-block of the periodic table. It is in period 7, the heaviest known member of the carbon group, and the last element whose chemistry has been investigated. Initial chemical studies in 2007–2008 indicated that flerovium was unexpectedly volatile for a group 14 element;[17] in preliminary results it even seemed to exhibit properties similar to noble gases.[18] More recent results show that flerovium's reaction with gold is similar to that of copernicium, showing it is very volatile and may even be gaseous at standard temperature and pressure, that it would show metallic properties, consistent with being the heavier homologue of lead, and that it would be the least reactive metal in group 14. Whether flerovium behaves more like a metal or a noble gas is still unresolved as of 2023; it might also be a semiconductor.

Very little is known about flerovium, as it can only be produced one atom at a time, either through direct synthesis or through radioactive decay of even heavier elements, and all known isotopes are short-lived. Six isotopes of flerovium are known, ranging in mass number between 284 and 289; the most stable of these, 289Fl, has a half-life of ~1.9 seconds, but the unconfirmed 290Fl may have a longer half-life of 19 seconds, which would be one of the longest half-lives of any nuclide in these farthest reaches of the periodic table. Flerovium is predicted to be near the centre of the theorized island of stability, and it is expected that heavier flerovium isotopes, especially the possibly magic 298Fl, may have even longer half-lives.

Introduction edit

This section is an excerpt from Superheavy element § Introduction.[edit]

Synthesis of superheavy nuclei edit

 
A graphic depiction of a nuclear fusion reaction. Two nuclei fuse into one, emitting a neutron. Reactions that created new elements to this moment were similar, with the only possible difference that several singular neutrons sometimes were released, or none at all.

A superheavy[a] atomic nucleus is created in a nuclear reaction that combines two other nuclei of unequal size[b] into one; roughly, the more unequal the two nuclei in terms of mass, the greater the possibility that the two react.[24] The material made of the heavier nuclei is made into a target, which is then bombarded by the beam of lighter nuclei. Two nuclei can only fuse into one if they approach each other closely enough; normally, nuclei (all positively charged) repel each other due to electrostatic repulsion. The strong interaction can overcome this repulsion but only within a very short distance from a nucleus; beam nuclei are thus greatly accelerated in order to make such repulsion insignificant compared to the velocity of the beam nucleus.[25] The energy applied to the beam nuclei to accelerate them can cause them to reach speeds as high as one-tenth of the speed of light. However, if too much energy is applied, the beam nucleus can fall apart.[25]

Coming close enough alone is not enough for two nuclei to fuse: when two nuclei approach each other, they usually remain together for approximately 10−20 seconds and then part ways (not necessarily in the same composition as before the reaction) rather than form a single nucleus.[25][26] This happens because during the attempted formation of a single nucleus, electrostatic repulsion tears apart the nucleus that is being formed.[25] Each pair of a target and a beam is characterized by its cross section—the probability that fusion will occur if two nuclei approach one another expressed in terms of the transverse area that the incident particle must hit in order for the fusion to occur.[c] This fusion may occur as a result of the quantum effect in which nuclei can tunnel through electrostatic repulsion. If the two nuclei can stay close for past that phase, multiple nuclear interactions result in redistribution of energy and an energy equilibrium.[25]

External videos
  Visualization of unsuccessful nuclear fusion, based on calculations from the Australian National University[28]

The resulting merger is an excited state[29]—termed a compound nucleus—and thus it is very unstable.[25] To reach a more stable state, the temporary merger may fission without formation of a more stable nucleus.[30] Alternatively, the compound nucleus may eject a few neutrons, which would carry away the excitation energy; if the latter is not sufficient for a neutron expulsion, the merger would produce a gamma ray. This happens in approximately 10−16 seconds after the initial nuclear collision and results in creation of a more stable nucleus.[30] The definition by the IUPAC/IUPAP Joint Working Party (JWP) states that a chemical element can only be recognized as discovered if a nucleus of it has not decayed within 10−14 seconds. This value was chosen as an estimate of how long it takes a nucleus to acquire its outer electrons and thus display its chemical properties.[31][d]

Decay and detection edit

The beam passes through the target and reaches the next chamber, the separator; if a new nucleus is produced, it is carried with this beam.[33] In the separator, the newly produced nucleus is separated from other nuclides (that of the original beam and any other reaction products)[e] and transferred to a surface-barrier detector, which stops the nucleus. The exact location of the upcoming impact on the detector is marked; also marked are its energy and the time of the arrival.[33] The transfer takes about 10−6 seconds; in order to be detected, the nucleus must survive this long.[36] The nucleus is recorded again once its decay is registered, and the location, the energy, and the time of the decay are measured.[33]

Stability of a nucleus is provided by the strong interaction. However, its range is very short; as nuclei become larger, its influence on the outermost nucleons (protons and neutrons) weakens. At the same time, the nucleus is torn apart by electrostatic repulsion between protons, and its range is not limited.[37] Total binding energy provided by the strong interaction increases linearly with the number of nucleons, whereas electrostatic repulsion increases with the square of the atomic number, i.e. the latter grows faster and becomes increasingly important for heavy and superheavy nuclei.[38][39] Superheavy nuclei are thus theoretically predicted[40] and have so far been observed[41] to predominantly decay via decay modes that are caused by such repulsion: alpha decay and spontaneous fission.[f] Almost all alpha emitters have over 210 nucleons,[43] and the lightest nuclide primarily undergoing spontaneous fission has 238.[44] In both decay modes, nuclei are inhibited from decaying by corresponding energy barriers for each mode, but they can be tunnelled through.[38][39]

 
Scheme of an apparatus for creation of superheavy elements, based on the Dubna Gas-Filled Recoil Separator set up in the Flerov Laboratory of Nuclear Reactions in JINR. The trajectory within the detector and the beam focusing apparatus changes because of a dipole magnet in the former and quadrupole magnets in the latter.[45]

Alpha particles are commonly produced in radioactive decays because mass of an alpha particle per nucleon is small enough to leave some energy for the alpha particle to be used as kinetic energy to leave the nucleus.[46] Spontaneous fission is caused by electrostatic repulsion tearing the nucleus apart and produces various nuclei in different instances of identical nuclei fissioning.[39] As the atomic number increases, spontaneous fission rapidly becomes more important: spontaneous fission partial half-lives decrease by 23 orders of magnitude from uranium (element 92) to nobelium (element 102),[47] and by 30 orders of magnitude from thorium (element 90) to fermium (element 100).[48] The earlier liquid drop model thus suggested that spontaneous fission would occur nearly instantly due to disappearance of the fission barrier for nuclei with about 280 nucleons.[39][49] The later nuclear shell model suggested that nuclei with about 300 nucleons would form an island of stability in which nuclei will be more resistant to spontaneous fission and will primarily undergo alpha decay with longer half-lives.[39][49] Subsequent discoveries suggested that the predicted island might be further than originally anticipated; they also showed that nuclei intermediate between the long-lived actinides and the predicted island are deformed, and gain additional stability from shell effects.[50] Experiments on lighter superheavy nuclei,[51] as well as those closer to the expected island,[47] have shown greater than previously anticipated stability against spontaneous fission, showing the importance of shell effects on nuclei.[g]

Alpha decays are registered by the emitted alpha particles, and the decay products are easy to determine before the actual decay; if such a decay or a series of consecutive decays produces a known nucleus, the original product of a reaction can be easily determined.[h] (That all decays within a decay chain were indeed related to each other is established by the location of these decays, which must be in the same place.)[33] The known nucleus can be recognized by the specific characteristics of decay it undergoes such as decay energy (or more specifically, the kinetic energy of the emitted particle).[i] Spontaneous fission, however, produces various nuclei as products, so the original nuclide cannot be determined from its daughters.[j]

The information available to physicists aiming to synthesize a superheavy element is thus the information collected at the detectors: location, energy, and time of arrival of a particle to the detector, and those of its decay. The physicists analyze this data and seek to conclude that it was indeed caused by a new element and could not have been caused by a different nuclide than the one claimed. Often, provided data is insufficient for a conclusion that a new element was definitely created and there is no other explanation for the observed effects; errors in interpreting data have been made.[k]

History edit

See also: Discovery of the chemical elements

Pre-discovery edit

In the late 1940s to early 1960s, the early days of making heavier and heavier transuranic elements, it was predicted that since such elements did not occur naturally, they would have shorter and shorter spontaneous fission half-lives, until they stopped existing altogether around element 108 (now called hassium). Initial work in synthesizing the heavier actinides seemed to confirm this.[62] But the nuclear shell model, introduced in 1949 and extensively developed in the late 1960s by William Myers and Władysław Świątecki, stated that protons and neutrons form shells within a nucleus, analogous to electron shells. Noble gases are unreactive due to a full electron shell; similarly, it was theorized that elements with full nuclear shells – those having "magic" numbers of protons or neutrons – would be stabilized against decay. A doubly magic isotope, with magic numbers of both protons and neutrons, would be especially stabilized. Heiner Meldner calculated in 1965 that the next doubly magic isotope after 208Pb was 298Fl with 114 protons and 184 neutrons, which would be the centre of an "island of stability".[62][63] This island of stability, supposedly from copernicium (Z = 112) to oganesson (Z = 118), would come after a long "sea of instability" from mendelevium (Z = 101) to roentgenium (Z = 111),[62] and the flerovium isotopes in it were speculated in 1966 to have half-lives over 108 years.[64] These early predictions fascinated researchers, and led to the first attempt to make flerovium, in 1968 with the reaction 248Cm(40Ar,xn). No flerovium atoms were detected; this was thought to be because the compound nucleus 288Fl only has 174 neutrons instead of the supposed magic 184, and this would have significant impact on the reaction cross section (yield) and half-lives of nuclei produced.[65][66] It was then 30 more years before flerovium was first made.[62] Later work suggests the islands of stability around hassium and flerovium occur because these nuclei are respectively deformed and oblate, which make them resistant to spontaneous fission, and that the true island of stability for spherical nuclei occurs at around unbibium-306 (122 protons, 184 neutrons).[67]

First signs edit

The first sign of flerovium was found in December 1998 by a team of scientists at Joint Institute for Nuclear Research (JINR), Dubna, Russia, led by Yuri Oganessian, who bombarded a target of plutonium-244 with accelerated nuclei of calcium-48:

244
94Pu
 + 48
20Ca
 → 292
114Fl
* → 290
114Fl
 + 2 1
0n

This reaction had been tried before, without success; for this 1998 attempt, JINR had upgraded all of its equipment to detect and separate the produced atoms better and bombard the target more intensely.[68] One atom of flerovium, alpha decaying with lifetime 30.4 s, was detected. The decay energy measured was 9.71 MeV, giving an expected half-life of 2–23 s.[69] This observation was assigned to 289Fl and was published in January 1999.[69] The experiment was later repeated, but an isotope with these decay properties was never observed again, so the exact identity of this activity is unknown. It may have been due to the isomer 289mFl,[70][71] but because the presence of a whole series of longer-lived isomers in its decay chain would be rather doubtful, the most likely assignment of this chain is to the 2n channel leading to 290Fl and electron capture to 290Nh. This fits well with the systematics and trends of flerovium isotopes, and is consistent with the low beam energy chosen for that experiment, though further confirmation would be desirable via synthesis of 294Lv in a 248Cm(48Ca,2n) reaction, which would alpha decay to 290Fl.[15] The RIKEN team reported possible synthesis of isotopes 294Lv and 290Fl in 2016 in a 248Cm(48Ca,2n) reaction, but the alpha decay of 294Lv was missed, alpha decay of 290Fl to 286Cn was observed instead of electron capture to 290Nh, and the assignment to 294Lv instead of 293Lv was not certain.[16]

Glenn T. Seaborg, a scientist at Lawrence Berkeley National Laboratory who had been involved in work to make such superheavy elements, had said in December 1997 that "one of his longest-lasting and most cherished dreams was to see one of these magic elements";[62] he was told of the synthesis of flerovium by his colleague Albert Ghiorso soon after its publication in 1999. Ghiorso later recalled:[72]

I wanted Glenn to know, so I went to his bedside and told him. I thought I saw a gleam in his eye, but the next day when I went to visit him he didn't remember seeing me. As a scientist, he had died when he had that stroke.[72]

— Albert Ghiorso

Seaborg died two months later, on 25 February 1999.[72]

In March 1999, the same team replaced the 244Pu target with 242Pu to make other flerovium isotopes. Two atoms of flerovium were produced as a result, each alpha-decaying with a half-life of 5.5 s. They were assigned as 287Fl.[73] This activity has not been seen again either, and it is unclear what nucleus was produced. It is possible that it was an isomer 287mFl[74] or from electron capture by 287Fl, leading to 287Nh and 283Rg.[75]

Confirmed discovery edit

The now-confirmed discovery of flerovium was made in June 1999 when the Dubna team repeated the first reaction from 1998. This time, two atoms of flerovium were produced; they alpha decayed with half-life 2.6 s, different from the 1998 result.[70] This activity was initially assigned to 288Fl in error, due to the confusion regarding the previous observations that were assumed to come from 289Fl. Further work in December 2002 finally allowed a positive reassignment of the June 1999 atoms to 289Fl.[74]

In May 2009, the Joint Working Party (JWP) of IUPAC published a report on the discovery of copernicium in which they acknowledged discovery of the isotope 283Cn.[76] This implied the discovery of flerovium, from the acknowledgement of the data for the synthesis of 287Fl and 291Lv, which decay to 283Cn. The discovery of flerovium-286 and -287 was confirmed in January 2009 at Berkeley. This was followed by confirmation of flerovium-288 and -289 in July 2009 at Gesellschaft für Schwerionenforschung (GSI) in Germany. In 2011, IUPAC evaluated the Dubna team's 1999–2007 experiments. They found the early data inconclusive, but accepted the results of 2004–2007 as flerovium, and the element was officially recognized as having been discovered.[77]

Isotopes edit

Main article: Isotopes of flerovium
List of flerovium isotopes
Isotope Half-life[l] Decay
mode 		Discovery
year 		Discovery
reaction
Value ref
284Fl 2.5 ms [11] SF 2015 240Pu(48Ca,4n)
239Pu(48Ca,3n)
285Fl 100 ms [12] α 2010 242Pu(48Ca,5n)
286Fl 105 ms [13] α, SF 2003 290Lv(—,α)
287Fl 360 ms [13] α, EC? 2003 244Pu(48Ca,5n)
288Fl 660 ms [78] α 2004 244Pu(48Ca,4n)
289Fl 1.9 s [78] α 1999 244Pu(48Ca,3n)
289mFl[m] 1.1 s [79] α 2012 293mLv(—,α)
290Fl[m] 19 s [15][16] α, EC? 1998 244Pu(48Ca,2n)

While the method of chemical characterization of a daughter was successful for flerovium and livermorium, and the simpler structure of even–even nuclei made confirmation of oganesson (Z = 118) straightforward, there have been difficulties in establishing the congruence of decay chains from isotopes with odd protons, odd neutrons, or both.[80][81] To get around this problem with hot fusion, the decay chains from which terminate in spontaneous fission instead of connecting to known nuclei as cold fusion allows, experiments were done in Dubna in 2015 to produce lighter isotopes of flerovium by reaction of 48Ca with 239Pu and 240Pu, particularly 283Fl, 284Fl, and 285Fl; the last had previously been characterized in the 242Pu(48Ca,5n)285Fl reaction at Lawrence Berkeley National Laboratory in 2010. 285Fl was more clearly characterized, while the new isotope 284Fl was found to undergo immediate spontaneous fission instead of alpha decay to known nuclides around the N = 162 shell closure, and 283Fl was not found.[11] This lightest isotope may yet conceivably be produced in the cold fusion reaction 208Pb(76Ge,n)283Fl,[15] which the team at RIKEN in Japan has considered investigating:[82][83] this reaction is expected to have a higher cross-section of 200 fb than the "world record" low of 30 fb for 209Bi(70Zn,n)278Nh, the reaction which RIKEN used for the official discovery of element 113 (nihonium).[15][84][85] The Dubna team repeated their investigation of the 240Pu+48Ca reaction in 2017, observing three new consistent decay chains of 285Fl, another decay chain from this nuclide that may pass through some isomeric states in its daughters, a chain that could be assigned to 287Fl (likely from 242Pu impurities in the target), and some spontaneous fissions of which some could be from 284Fl, though other interpretations including side reactions involving evaporation of charged particles are also possible.[12]

Naming edit

 
Stamp of Russia, issued in 2013, dedicated to Georgy Flyorov and flerovium

Per Mendeleev's nomenclature for unnamed and undiscovered elements, flerovium is sometimes called eka-lead. In 1979, IUPAC published recommendations according to which the element was to be called ununquadium (symbol Uuq),[86] a systematic element name as a placeholder, until the discovery of the element is confirmed and a permanent name is decided on. Most scientists in the field called it "element 114", with the symbol of E114, (114) or 114.[3]

Per IUPAC recommendations, the discoverer(s) of a new element has the right to suggest a name.[87] After IUPAC recognized the discovery of flerovium and livermorium on 1 June 2011, IUPAC asked the discovery team at JINR to suggest permanent names for the two elements. The Dubna team chose the name flerovium (symbol Fl),[88][89] after Russia's Flerov Laboratory of Nuclear Reactions (FLNR), named after Soviet physicist Georgy Flyorov (also spelled Flerov); earlier reports claim the element name was directly proposed to honour Flyorov.[90] In accordance with the proposal received from the discoverers, IUPAC officially named flerovium after Flerov Laboratory of Nuclear Reactions, not after Flyorov himself.[9] Flyorov is known for writing to Joseph Stalin in April 1942 and pointing out the silence in scientific journals in the field of nuclear fission in the United States, Great Britain, and Germany. Flyorov deduced that this research must have become classified information in those countries. Flyorov's work and urgings led to the development of the USSR's own atomic bomb project.[89] Flyorov is also known for the discovery of spontaneous fission with Konstantin Petrzhak. The naming ceremony for flerovium and livermorium was held on 24 October 2012 in Moscow.[91]

In a 2015 interview with Oganessian, the host, in preparation to ask a question, said, "You said you had dreamed to name [an element] after your teacher Georgy Flyorov." Without letting the host finish, Oganessian repeatedly said, "I did."[92]

Predicted properties edit

Very few properties of flerovium or its compounds have been measured; due to its extremely limited and expensive production[93] and the fact that it decays very quickly. A few singular properties have been measured, but for the most part, properties of flerovium remain unknown and only predictions are available.

Nuclear stability and isotopes edit

Main article: Isotopes of flerovium
 
Regions of differently shaped nuclei, as predicted by the interacting boson model[67]

The basis of the chemical periodicity in the periodic table is the electron shell closure at each noble gas (atomic numbers 2, 10, 18, 36, 54, 86, and 118): as any further electrons must enter a new shell with higher energy, closed-shell electron configurations are markedly more stable, hence the inertness of noble gases.[94] Protons and neutrons are also known to form closed nuclear shells, so the same happens at nucleon shell closures, which happen at specific nucleon numbers often dubbed "magic numbers". The known magic numbers are 2, 8, 20, 28, 50, and 82 for protons and neutrons; also 126 for neutrons.[94] Nuclei with magic proton and neutron numbers, such as helium-4, oxygen-16, calcium-48, and lead-208, are "doubly magic" and are very stable. This stability is very important for superheavy elements: with no stabilization, half-lives would be expected by exponential extrapolation to be nanoseconds at darmstadtium (element 110), because the ever-increasing electrostatic repulsion between protons overcomes the limited-range strong nuclear force that holds nuclei together. The next closed nucleon shells (magic numbers) are thought to denote the centre of the long-sought island of stability, where half-lives to alpha decay and spontaneous fission lengthen again.[94]

 
Orbitals with high azimuthal quantum number are raised in energy, eliminating what would otherwise be a gap in orbital energy corresponding to a closed proton shell at element 114. This raises the next proton shell to the region around element 120.[67]

Initially, by analogy with neutron magic number 126, the next proton shell was also expected at element 126, too far beyond the synthesis capabilities of the mid-20th century to get much theoretical attention. In 1966, new values for the potential and spin–orbit interaction in this region of the periodic table[95] contradicted this and predicted that the next proton shell would instead be at element 114,[94] and that nuclei in this region would be relatively stable against spontaneous fission.[94] The expected closed neutron shells in this region were at neutron number 184 or 196, making 298Fl and 310Fl candidates for being doubly magic.[94] 1972 estimates predicted a half-life of around 1 year for 298Fl, which was expected to be near an island of stability centered near 294Ds (with a half-life around 1010 years, comparable to 232Th).[94] After making the first isotopes of elements 112–118 at the turn of the 21st century, it was found that these neutron-deficient isotopes were stabilized against fission. In 2008 it was thus hypothesized that the stabilization against fission of these nuclides was due to their oblate nuclei, and that a region of oblate nuclei was centred on 288Fl. Also, new theoretical models showed that the expected energy gap between the proton orbitals 2f7/2 (filled at element 114) and 2f5/2 (filled at element 120) was smaller than expected, so element 114 no longer appeared to be a stable spherical closed nuclear shell. The next doubly magic nucleus is now expected to be around 306Ubb, but this nuclide's expected short half-life and low production cross section make its synthesis challenging.[67] Still, the island of stability is expected to exist in this region, and nearer its centre (which has not been approached closely enough yet) some nuclides, such as 291Mc and its alpha- and beta-decay daughters,[n] may be found to decay by positron emission or electron capture and thus move into the centre of the island.[84] Due to the expected high fission barriers, any nucleus in this island of stability would decay exclusively by alpha decay and perhaps some electron capture and beta decay,[94] both of which would bring the nuclei closer to the beta-stability line where the island is expected to be. Electron capture is needed to reach the island, which is problematic because it is not certain that electron capture is a major decay mode in this region of the chart of nuclides.[84]

Experiments were done in 2000–2004 at Flerov Laboratory of Nuclear Reactions in Dubna studying the fission properties of the compound nucleus 292Fl by bombarding 244Pu with accelerated 48Ca ions.[96] A compound nucleus is a loose combination of nucleons that have not yet arranged themselves into nuclear shells. It has no internal structure and is held together only by the collision forces between the two nuclei.[97][o] Results showed how such nuclei fission mainly by expelling doubly magic or nearly doubly magic fragments such as 40Ca, 132Sn, 208Pb, or 209Bi. It was also found that 48Ca and 58Fe projectiles had a similar yield for the fusion-fission pathway, suggesting possible future use of 58Fe projectiles in making superheavy elements.[96] It has also been suggested that a neutron-rich flerovium isotope can be formed by quasifission (partial fusion followed by fission) of a massive nucleus.[98] Recently it has been shown that multi-nucleon transfer reactions in collisions of actinide nuclei (such as uranium and curium) might be used to make neutron-rich superheavy nuclei in the island of stability,[98] though production of neutron-rich nobelium or seaborgium is more likely.[84]

Theoretical estimates of alpha decay half-lives of flerovium isotopes, support the experimental data.[99][100] The fission-survived isotope 298Fl, long expected to be doubly magic, is predicted to have alpha decay half-life ~17 days.[101][102] Making 298Fl directly by a fusion–evaporation pathway is currently impossible: no known combination of target and stable projectile can give 184 neutrons for the compound nucleus, and radioactive projectiles such as 50Ca (half-life 14 s) cannot yet be used in the needed quantity and intensity.[98] One possibility for making the theorized long-lived nuclei of copernicium (291Cn and 293Cn) and flerovium near the middle of the island, is using even heavier targets such as 250Cm, 249Bk, 251Cf, and 254Es, that when fused with 48Ca would yield isotopes such as 291Mc and 291Fl (as decay products of 299Uue, 295Ts, and 295Lv), which may have just enough neutrons to alpha decay to nuclides close enough to the centre of the island to possibly undergo electron capture and move inward to the centre. However, reaction cross sections would be small and little is yet known about the decay properties of superheavies near the beta-stability line. This may be the current best hope to synthesize nuclei in the island of stability, but it is speculative and may or may not work in practice.[84] Another possibility is to use controlled nuclear explosions to get the high neutron flux needed to make macroscopic amounts of such isotopes.[84] This would mimic the r-process where the actinides were first produced in nature and the gap of instability after polonium bypassed, as it would bypass the gaps of instability at 258–260Fm and at mass number 275 (atomic numbers 104 to 108).[84] Some such isotopes (especially 291Cn and 293Cn) may even have been synthesized in nature, but would decay far too quickly (with half-lives of only thousands of years) and be produced in far too small quantities (~10−12 the abundance of lead) to be detectable today outside cosmic rays.[84]

Atomic and physical edit

Flerovium is in group 14 in the periodic table, below carbon, silicon, germanium, tin, and lead. Every previous group 14 element has 4 electrons in its valence shell, hence valence electron configuration ns2np2. For flerovium, the trend will continue and the valence electron configuration is predicted as 7s27p2;[3] flerovium will be similar to its lighter congeners in many ways. Differences are likely to arise; a large contributor is spin–orbit (SO) interaction—mutual interaction between the electrons' motion and spin. It is especially strong in superheavy elements, because the electrons move faster than in lighter atoms, at speeds comparable to the speed of light.[103] For flerovium, it lowers the 7s and the 7p electron energy levels (stabilizing the corresponding electrons), but two of the 7p electron energy levels are stabilized more than the other four.[104] The stabilization of the 7s electrons is called the inert pair effect, and the effect "tearing" the 7p subshell into the more and less stabilized parts is called subshell splitting. Computational chemists see the split as a change of the second (azimuthal) quantum number ℓ from 1 to 1⁄2 and 3⁄2 for the more stabilized and less stabilized parts of the 7p subshell, respectively.[105][p] For many theoretical purposes, the valence electron configuration may be represented to reflect the 7p subshell split as 7s2
7p2
1/2.[3] These effects cause flerovium's chemistry to be somewhat different from that of its lighter neighbours.

Because the spin–orbit splitting of the 7p subshell is very large in flerovium, and both of flerovium's filled orbitals in the 7th shell are stabilized relativistically; the valence electron configuration of flerovium may be considered to have a completely filled shell. Its first ionization energy of 8.539 eV (823.9 kJ/mol) should be the second-highest in group 14.[3] The 6d electron levels are also destabilized, leading to some early speculations that they may be chemically active, though newer work suggests this is unlikely.[94] Because the first ionization energy is higher than in silicon and germanium, though still lower than in carbon, it has been suggested that flerovium could be classed as a metalloid.[106]

Flerovium's closed-shell electron configuration means metallic bonding in metallic flerovium is weaker than in the elements before and after; so flerovium is expected to have a low boiling point,[3] and has recently been suggested to be possibly a gaseous metal, similar to predictions for copernicium, which also has a closed-shell electron configuration.[67] Flerovium's melting and boiling points were predicted in the 1970s to be around 70 and 150 °C,[3] significantly lower than for the lighter group 14 elements (lead has 327 and 1749 °C), and continuing the trend of decreasing boiling points down the group. Earlier studies predicted a boiling point of ~1000 °C or 2840 °C,[94] but this is now considered unlikely because of the expected weak metallic bonding and that group trends would expect flerovium to have low sublimation enthalpy.[3] Preliminary 2021 calculations predicted that flerovium should have melting point −73 °C (lower than mercury at −39 °C and copernicium, predicted 10 ± 11 °C) and boiling point 107 °C, which would make it a liquid metal.[107] Like mercury, radon, and copernicium, but not lead and oganesson (eka-radon), flerovium is calculated to have no electron affinity.[108]

A 2010 study published calculations predicting a hexagonal close-packed crystal structure for flerovium due to spin–orbit coupling effects, and a density of 9.928 g/cm3, though this was noted to be probably slightly too low.[109] Newer calculations published in 2017 expected flerovium to crystallize in face-centred cubic crystal structure like its lighter congener lead,[110] and calculations published in 2022 predicted a density of 11.4 ± 0.3 g/cm3, similar to lead (11.34 g/cm3). These calculations found that the face-centred cubic and hexagonal close-packed structures should have nearly the same energy, a phenomenon reminiscent of the noble gases. These calculations predict that hexagonal close-packed flerovium should be a semiconductor, with a band gap of 0.8 ± 0.3 eV. (Copernicium is also predicted to be a semiconductor.) These calculations predict that the cohesive energy of flerovium should be around −0.5 ± 0.1 eV; this is similar to that predicted for oganesson (−0.45 eV), larger than that predicted for copernicium (−0.38 eV), but smaller than that of mercury (−0.79 eV). The melting point was calculated as 284 ± 50 K (11 ± 50 °C), so that flerovium is probably a liquid at room temperature, although the boiling point was not determined.[4]

The electron of a hydrogen-like flerovium ion (Fl113+; remove all but one electron) is expected to move so fast that its mass is 1.79 times that of a stationary electron, due to relativistic effects. (The figures for hydrogen-like lead and tin are expected to be 1.25 and 1.073 respectively.[111]) Flerovium would form weaker metal–metal bonds than lead and would be adsorbed less on surfaces.[111]

Chemical edit

Flerovium is the heaviest known member of group 14, below lead, and is projected to be the second member of the 7p series of elements. Nihonium and flerovium are expected to form a very short subperiod corresponding to the filling of the 7p1/2 orbital, coming between the filling of the 6d5/2 and 7p3/2 subshells. Their chemical behaviour is expected to be very distinctive: nihonium's homology to thallium has been called "doubtful" by computational chemists, while flerovium's to lead has been called only "formal".[112]

The first five group 14 members show a +4 oxidation state and the latter members have increasingly prominent +2 chemistry due to onset of the inert pair effect. For tin, the +2 and +4 states are similar in stability, and lead(II) is the most stable of all the chemically well-understood +2 oxidation states in group 14.[3] The 7s orbitals are very highly stabilized in flerovium, so a very large sp3 orbital hybridization is needed to achieve a +4 oxidation state, so flerovium is expected to be even more stable than lead in its strongly predominant +2 oxidation state and its +4 oxidation state should be highly unstable.[3] For example, the dioxide (FlO2) is expected to be highly unstable to decomposition into its constituent elements (and would not be formed by direct reaction of flerovium with oxygen),[3][113] and flerovane (FlH4), which should have Fl–H bond lengths of 1.787 Å[6] and would be the heaviest homologue of methane (the lighter compounds include silane, germane and stannane), is predicted to be more thermodynamically unstable than plumbane, spontaneously decomposing to flerovium(II) hydride (FlH2) and H2.[114] The tetrafluoride FlF4[115] would have bonding mostly due to sd hybridizations rather than sp3 hybridizations,[94] and its decomposition to the difluoride and fluorine gas would be exothermic.[6] The other tetrahalides (for example, FlCl4 is destabilized by about 400 kJ/mol) decompose similarly.[6] The corresponding polyfluoride anion FlF2−
6 should be unstable to hydrolysis in aqueous solution, and flerovium(II) polyhalide anions such as FlBr−
3 and FlI−
3 are predicted to form preferentially in solutions.[3] The sd hybridizations were suggested in early calculations, as flerovium's 7s and 6d electrons share about the same energy, which would allow a volatile hexafluoride to form, but later calculations do not confirm this possibility.[94] In general, spin–orbit contraction of the 7p1/2 orbital should lead to smaller bond lengths and larger bond angles: this has been theoretically confirmed in FlH2.[6] Still, even FlH2 should be relativistically destabilized by 2.6 eV to below Fl+H2; the large spin–orbit effects also break down the usual singlet–triplet divide in the group 14 dihydrides. FlF2 and FlCl2 are predicted to be more stable than FlH2.[116]

Due to relativistic stabilization of flerovium's 7s27p2
1/2 valence electron configuration, the 0 oxidation state should also be more stable for flerovium than for lead, as the 7p1/2 electrons begin to also have a mild inert pair effect:[3] this stabilization of the neutral state may bring about some similarities between the behavior of flerovium and the noble gas radon.[18] Due to flerovium's expected relative inertness, diatomic compounds FlH and FlF should have lower energies of dissociation than the corresponding lead compounds PbH and PbF.[6] Flerovium(IV) should be even more electronegative than lead(IV);[115] lead(IV) has electronegativity 2.33 on the Pauling scale, though the lead(II) value is only 1.87. Flerovium could be a noble metal.[3]

Flerovium(II) should be more stable than lead(II), and halides FlX+, FlX2, FlX−
3, and FlX2−
4 (X = Cl, Br, I) are expected to form readily. The fluorides would undergo strong hydrolysis in aqueous solution.[3] All flerovium dihalides are expected to be stable;[3] the difluoride being water-soluble.[117] Spin–orbit effects would destabilize the dihydride (FlH2) by almost 2.6 eV (250 kJ/mol).[113] In aqueous solution, the oxyanion flerovite (FlO2−
2) would also form, analogous to plumbite. Flerovium(II) sulfate (FlSO4) and sulfide (FlS) should be very insoluble in water, and flerovium(II) acetate (FlC2H3O2) and nitrate (Fl(NO3)2) should be quite water-soluble.[94] The standard electrode potential for reduction of Fl2+ ion to metallic flerovium is estimated to be around +0.9 V, confirming the increased stability of flerovium in the neutral state.[3] In general, due to relativistic stabilization of the 7p1/2 spinor, Fl2+ is expected to have properties intermediate between those of Hg2+ or Cd2+ and its lighter congener Pb2+.[3]

Experimental chemistry edit

Flerovium is currently the last element whose chemistry has been experimentally investigated, though studies so far are not conclusive. Two experiments were done in April–May 2007 in a joint FLNR-PSI collaboration to study copernicium chemistry. The first experiment used the reaction 242Pu(48Ca,3n)287Fl; and the second, 244Pu(48Ca,4n)288Fl: these reactions give short-lived flerovium isotopes whose copernicium daughters would then be studied.[118] Adsorption properties of the resultant atoms on a gold surface were compared to those of radon, as it was then expected that copernicium's full-shell electron configuration would lead to noble-gas like behavior.[118] Noble gases interact with metal surfaces very weakly, which is uncharacteristic of metals.[118]

The first experiment found 3 atoms of 283Cn but seemingly also 1 atom of 287Fl. This was a surprise; transport time for the product atoms is ~2 s, so the flerovium should have decayed to copernicium before adsorption. In the second reaction, 2 atoms of 288Fl and possibly 1 of 289Fl were seen. Two of the three atoms showed adsorption characteristics associated with a volatile, noble-gas-like element, which has been suggested but is not predicted by more recent calculations. These experiments gave independent confirmation for the discovery of copernicium, flerovium, and livermorium via comparison with published decay data. Further experiments in 2008 to confirm this important result detected 1 atom of 289Fl, and supported previous data showing flerovium had a noble-gas-like interaction with gold.[118]

Empirical support for a noble-gas-like flerovium soon weakened. In 2009 and 2010, the FLNR-PSI collaboration synthesized more flerovium to follow up their 2007 and 2008 studies. In particular, the first three flerovium atoms made in the 2010 study suggested again a noble-gas-like character, but the complete set taken together resulted in a more ambiguous interpretation, unusual for a metal in the carbon group but not fully like a noble gas in character.[119] In their paper, the scientists refrained from calling flerovium's chemical properties "close to those of noble gases", as had previously been done in the 2008 study.[119] Flerovium's volatility was again measured through interactions with a gold surface, and provided indications that the volatility of flerovium was comparable to that of mercury, astatine, and the simultaneously investigated copernicium, which had been shown in the study to be a very volatile noble metal, conforming to its being the heaviest known group 12 element.[119] Still, it was pointed out that this volatile behavior was not expected for a usual group 14 metal.[119]

In experiments in 2012 at GSI, flerovium's chemistry was found to be more metallic than noble-gas-like. Jens Volker Kratz and Christoph Düllmann specifically named copernicium and flerovium as being in a new category of "volatile metals"; Kratz even speculated that they might be gases at standard temperature and pressure.[67][120] These "volatile metals", as a category, were expected to fall between normal metals and noble gases in terms of adsorption properties.[67] Contrary to the 2009 and 2010 results, it was shown in the 2012 experiments that the interactions of flerovium and copernicium respectively with gold were about equal.[121] Further studies showed that flerovium was more reactive than copernicium, in contradiction to previous experiments and predictions.[67]

In a 2014 paper detailing the experimental results of the chemical characterization of flerovium, the GSI group wrote: "[flerovium] is the least reactive element in the group, but still a metal."[122] Nevertheless, in a 2016 conference about chemistry and physics of heavy and superheavy elements, Alexander Yakushev and Robert Eichler, two scientists who had been active at GSI and FLNR in determining flerovium's chemistry, still urged caution based on the inconsistencies of the various experiments previously listed, noting that the question of whether flerovium was a metal or a noble gas was still open with the known evidence: one study suggested a weak noble-gas-like interaction between flerovium and gold, while the other suggested a stronger metallic interaction.[123] The longer-lived isotope 289Fl has been considered of interest for future radiochemical studies.[124]

New experiments published in 2022 suggest that flerovium is a metal, exhibiting lower reactivity towards gold than mercury, but higher reactivity than radon. The experiments could not identify if the adsorption was due to elemental flerovium (considered more likely), or if it was due to a flerovium compound such as FlO that was more reactive towards gold than elemental flerovium, but both scenarios involve flerovium forming chemical bonds.[125][126]

See also edit

Notes edit

  1. ^ In nuclear physics, an element is called heavy if its atomic number is high; lead (element 82) is one example of such a heavy element. The term "superheavy elements" typically refers to elements with atomic number greater than 103 (although there are other definitions, such as atomic number greater than 100[19] or 112;[20] sometimes, the term is presented an equivalent to the term "transactinide", which puts an upper limit before the beginning of the hypothetical superactinide series).[21] Terms "heavy isotopes" (of a given element) and "heavy nuclei" mean what could be understood in the common language—isotopes of high mass (for the given element) and nuclei of high mass, respectively.
  2. ^ In 2009, a team at the JINR led by Oganessian published results of their attempt to create hassium in a symmetric 136Xe + 136Xe reaction. They failed to observe a single atom in such a reaction, putting the upper limit on the cross section, the measure of probability of a nuclear reaction, as 2.5 pb.[22] In comparison, the reaction that resulted in hassium discovery, 208Pb + 58Fe, had a cross section of ~20 pb (more specifically, 19+19
    -11     pb), as estimated by the discoverers.[23]
  3. ^ The amount of energy applied to the beam particle to accelerate it can also influence the value of cross section. For example, in the 28
    14    Si
     + 1
    0    n
     → 28
    13    Al
     + 1
    1    p
     reaction, cross section changes smoothly from 370 mb at 12.3 MeV to 160 mb at 18.3 MeV, with a broad peak at 13.5 MeV with the maximum value of 380 mb.[27]
  4. ^ This figure also marks the generally accepted upper limit for lifetime of a compound nucleus.[32]
  5. ^ This separation is based on that the resulting nuclei move past the target more slowly then the unreacted beam nuclei. The separator contains electric and magnetic fields whose effects on a moving particle cancel out for a specific velocity of a particle.[34] Such separation can also be aided by a time-of-flight measurement and a recoil energy measurement; a combination of the two may allow to estimate the mass of a nucleus.[35]
  6. ^ Not all decay modes are caused by electrostatic repulsion. For example, beta decay is caused by the weak interaction.[42]
  7. ^ It was already known by the 1960s that ground states of nuclei differed in energy and shape as well as that certain magic numbers of nucleons corresponded to greater stability of a nucleus. However, it was assumed that there was no nuclear structure in superheavy nuclei as they were too deformed to form one.[47]
  8. ^ Since mass of a nucleus is not measured directly but is rather calculated from that of another nucleus, such measurement is called indirect. Direct measurements are also possible, but for the most part they have remained unavailable for superheavy nuclei.[52] The first direct measurement of mass of a superheavy nucleus was reported in 2018 at LBNL.[53] Mass was determined from the location of a nucleus after the transfer (the location helps determine its trajectory, which is linked to the mass-to-charge ratio of the nucleus, since the transfer was done in presence of a magnet).[54]
  9. ^ If the decay occurred in a vacuum, then since total momentum of an isolated system before and after the decay must be preserved, the daughter nucleus would also receive a small velocity. The ratio of the two velocities, and accordingly the ratio of the kinetic energies, would thus be inverse to the ratio of the two masses. The decay energy equals the sum of the known kinetic energy of the alpha particle and that of the daughter nucleus (an exact fraction of the former).[43] The calculations hold for an experiment as well, but the difference is that the nucleus does not move after the decay because it is tied to the detector.
  10. ^ Spontaneous fission was discovered by Soviet physicist Georgy Flerov,[55] a leading scientist at JINR, and thus it was a "hobbyhorse" for the facility.[56] In contrast, the LBL scientists believed fission information was not sufficient for a claim of synthesis of an element. They believed spontaneous fission had not been studied enough to use it for identification of a new element, since there was a difficulty of establishing that a compound nucleus had only ejected neutrons and not charged particles like protons or alpha particles.[32] They thus preferred to link new isotopes to the already known ones by successive alpha decays.[55]
  11. ^ For instance, element 102 was mistakenly identified in 1957 at the Nobel Institute of Physics in Stockholm, Stockholm County, Sweden.[57] There were no earlier definitive claims of creation of this element, and the element was assigned a name by its Swedish, American, and British discoverers, nobelium. It was later shown that the identification was incorrect.[58] The following year, RL was unable to reproduce the Swedish results and announced instead their synthesis of the element; that claim was also disproved later.[58] JINR insisted that they were the first to create the element and suggested a name of their own for the new element, joliotium;[59] the Soviet name was also not accepted (JINR later referred to the naming of the element 102 as "hasty").[60] This name was proposed to IUPAC in a written response to their ruling on priority of discovery claims of elements, signed 29 September 1992.[60] The name "nobelium" remained unchanged on account of its widespread usage.[61]
  12. ^ Different sources give different values for half-lives; the most recently published values are listed.
  13. ^ a b This isotope is unconfirmed
  14. ^ Specifically, 291Mc, 291Fl, 291Nh, 287Nh, 287Cn, 287Rg, 283Rg, and 283Ds, which are expected to decay to the relatively longer-lived nuclei 283Mt, 287Ds, and 291Cn.[84]
  15. ^ It is estimated that it requires around 10−14 s for the nucleons to arrange themselves into nuclear shells, at which point the compound nucleus becomes a nuclide, and this number is used by IUPAC as the minimum half-life a claimed isotope must have to be recognized as a nuclide.[97]
  16. ^ The quantum number corresponds to the letter in the electron orbital name: 0 to s, 1 to p, 2 to d, etc. See azimuthal quantum number for more information.

References edit

  1. ^ Flerovium and Livermorium. The Periodic Table of Videos. University of Nottingham. 2 December 2011. Retrieved 4 June 2012.
  2. ^ . Lexico UK English Dictionary UK English Dictionary UK English Dictionary. Oxford University Press. Archived from the original on 5 February 2021.
  3. ^ a b c d e f g h i j k l m n o p q r s t Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 978-1-4020-3555-5.
  4. ^ a b c d Florez, Edison; Smits, Odile R.; Mewes, Jan-Michael; Jerabek, Paul; Schwerdtfeger, Peter (2022). "From the gas phase to the solid state: The chemical bonding in the superheavy element flerovium". The Journal of Chemical Physics. 157. doi:10.1063/5.0097642.
  5. ^ a b c d e Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry. Structure and Bonding. 21: 89–144. doi:10.1007/BFb0116498. ISBN 978-3-540-07109-9. Retrieved 4 October 2013.
  6. ^ a b c d e f Schwerdtfeger, Peter; Seth, Michael (2002). "Relativistic Quantum Chemistry of the Superheavy Elements. Closed-Shell Element 114 as a Case Study" (PDF). Journal of Nuclear and Radiochemical Sciences. 3 (1): 133–136. doi:10.14494/jnrs2000.3.133. Retrieved 12 September 2014.
  7. ^ Pershina, Valeria (30 November 2013). "Theoretical Chemistry of the Heaviest Elements". In Schädel, Matthias; Shaughnessy, Dawn (eds.). The Chemistry of Superheavy Elements (2nd ed.). Springer Science & Business Media. p. 154. ISBN 9783642374661.
  8. ^ Bonchev, Danail; Kamenska, Verginia (1981). "Predicting the Properties of the 113–120 Transactinide Elements". Journal of Physical Chemistry. American Chemical Society. 85 (9): 1177–1186. doi:10.1021/j150609a021.
  9. ^ a b (Press release). IUPAC. 30 May 2012. Archived from the original on 2 June 2012.
  10. ^ Utyonkov, V.K.; et al. (2015). Synthesis of superheavy nuclei at limits of stability: 239,240Pu + 48Ca and 249–251Cf + 48Ca reactions (PDF). Super Heavy Nuclei International Symposium, Texas A & M University, College Station TX, USA, March 31 – April 02, 2015.
  11. ^ a b c Utyonkov, V. K.; Brewer, N. T.; Oganessian, Yu. Ts.; Rykaczewski, K. P.; et al. (15 September 2015). "Experiments on the synthesis of superheavy nuclei 284Fl and 285Fl in the 239,240Pu + 48Ca reactions". Physical Review C. 92 (3): 034609. Bibcode:2015PhRvC..92c4609U. doi:10.1103/PhysRevC.92.034609.
  12. ^ a b c Utyonkov, V. K.; Brewer, N. T.; Oganessian, Yu. Ts.; Rykaczewski, K. P.; et al. (30 January 2018). "Neutron-deficient superheavy nuclei obtained in the 240Pu+48Ca reaction". Physical Review C. 97 (14320): 1–10. Bibcode:2018PhRvC..97a4320U. doi:10.1103/PhysRevC.97.014320.
  13. ^ a b c d Oganessian, Yu. Ts.; Utyonkov, V. K.; Ibadullayev, D.; et al. (2022). "Investigation of 48Ca-induced reactions with 242Pu and 238U targets at the JINR Superheavy Element Factory". Physical Review C. 106 (024612). doi:10.1103/PhysRevC.106.024612.
  14. ^ Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; et al. (2016). "Remarks on the Fission Barriers of SHN and Search for Element 120". In Peninozhkevich, Yu. E.; Sobolev, Yu. G. (eds.). Exotic Nuclei: EXON-2016 Proceedings of the International Symposium on Exotic Nuclei. Exotic Nuclei. pp. 155–164. ISBN 9789813226555.
  15. ^ a b c d e Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; et al. (2016). "Review of even element super-heavy nuclei and search for element 120". The European Physics Journal A. 2016 (52). Bibcode:2016EPJA...52..180H. doi:10.1140/epja/i2016-16180-4.
  16. ^ a b c Kaji, Daiya; Morita, Kosuke; Morimoto, Kouji; Haba, Hiromitsu; et al. (2017). "Study of the Reaction 48Ca + 248Cm → 296Lv* at RIKEN-GARIS". Journal of the Physical Society of Japan. 86: 034201-1–7. Bibcode:2017JPSJ...86c4201K. doi:10.7566/JPSJ.86.034201.
  17. ^ Eichler, Robert; et al. (2010). "Indication for a volatile element 114" (PDF). Radiochimica Acta. 98 (3): 133–139. doi:10.1524/ract.2010.1705. S2CID 95172228.
  18. ^ a b Gäggeler, H. W. (5–7 November 2007). (PDF). Paul Scherrer Institute. Archived from the original (PDF) on 20 February 2012. Retrieved 10 August 2013.
  19. ^ Krämer, K. (2016). "Explainer: superheavy elements". Chemistry World. Retrieved 15 March 2020.
  20. ^ . Lawrence Livermore National Laboratory. Archived from the original on 11 September 2015. Retrieved 15 March 2020.
  21. ^ Eliav, E.; Kaldor, U.; Borschevsky, A. (2018). "Electronic Structure of the Transactinide Atoms". In Scott, R. A. (ed.). Encyclopedia of Inorganic and Bioinorganic Chemistry. John Wiley & Sons. pp. 1–16. doi:10.1002/9781119951438.eibc2632. ISBN 978-1-119-95143-8. S2CID 127060181.
  22. ^ Oganessian, Yu. Ts.; Dmitriev, S. N.; Yeremin, A. V.; et al. (2009). "Attempt to produce the isotopes of element 108 in the fusion reaction 136Xe + 136Xe". Physical Review C. 79 (2): 024608. doi:10.1103/PhysRevC.79.024608. ISSN 0556-2813.
  23. ^ Münzenberg, G.; Armbruster, P.; Folger, H.; et al. (1984). (PDF). Zeitschrift für Physik A. 317 (2): 235–236. Bibcode:1984ZPhyA.317..235M. doi:10.1007/BF01421260. S2CID 123288075. Archived from the original (PDF) on 7 June 2015. Retrieved 20 October 2012.
  24. ^ Subramanian, S. (28 August 2019). "Making New Elements Doesn't Pay. Just Ask This Berkeley Scientist". Bloomberg Businessweek. Retrieved 18 January 2020.
  25. ^ a b c d e f Ivanov, D. (2019). "Сверхтяжелые шаги в неизвестное" [Superheavy steps into the unknown]. nplus1.ru (in Russian). Retrieved 2 February 2020.
  26. ^ Hinde, D. (2017). "Something new and superheavy at the periodic table". The Conversation. Retrieved 30 January 2020.
  27. ^ Kern, B. D.; Thompson, W. E.; Ferguson, J. M. (1959). "Cross sections for some (n, p) and (n, α) reactions". Nuclear Physics. 10: 226–234. Bibcode:1959NucPh..10..226K. doi:10.1016/0029-5582(59)90211-1.
  28. ^ Wakhle, A.; Simenel, C.; Hinde, D. J.; et al. (2015). Simenel, C.; Gomes, P. R. S.; Hinde, D. J.; et al. (eds.). "Comparing Experimental and Theoretical Quasifission Mass Angle Distributions". European Physical Journal Web of Conferences. 86: 00061. Bibcode:2015EPJWC..8600061W. doi:10.1051/epjconf/20158600061. hdl:1885/148847. ISSN 2100-014X.
  29. ^ "Nuclear Reactions" (PDF). pp. 7–8. Retrieved 27 January 2020. Published as Loveland, W. D.; Morrissey, D. J.; Seaborg, G. T. (2005). "Nuclear Reactions". Modern Nuclear Chemistry. John Wiley & Sons, Inc. pp. 249–297. doi:10.1002/0471768626.ch10. ISBN 978-0-471-76862-3.
  30. ^ a b Krása, A. (2010). "Neutron Sources for ADS". Faculty of Nuclear Sciences and Physical Engineering. Czech Technical University in Prague: 4–8. S2CID 28796927.
  31. ^ Wapstra, A. H. (1991). "Criteria that must be satisfied for the discovery of a new chemical element to be recognized" (PDF). Pure and Applied Chemistry. 63 (6): 883. doi:10.1351/pac199163060879. ISSN 1365-3075. S2CID 95737691.
  32. ^ a b Hyde, E. K.; Hoffman, D. C.; Keller, O. L. (1987). "A History and Analysis of the Discovery of Elements 104 and 105". Radiochimica Acta. 42 (2): 67–68. doi:10.1524/ract.1987.42.2.57. ISSN 2193-3405. S2CID 99193729.
  33. ^ a b c d Chemistry World (2016). "How to Make Superheavy Elements and Finish the Periodic Table [Video]". Scientific American. Retrieved 27 January 2020.
  34. ^ Hoffman, Ghiorso & Seaborg 2000, p. 334.
  35. ^ Hoffman, Ghiorso & Seaborg 2000, p. 335.
  36. ^ Zagrebaev, Karpov & Greiner 2013, p. 3.
  37. ^ Beiser 2003, p. 432.
  38. ^ a b Pauli, N. (2019). "Alpha decay" (PDF). Introductory Nuclear, Atomic and Molecular Physics (Nuclear Physics Part). Université libre de Bruxelles. Retrieved 16 February 2020.
  39. ^ a b c d e Pauli, N. (2019). "Nuclear fission" (PDF). Introductory Nuclear, Atomic and Molecular Physics (Nuclear Physics Part). Université libre de Bruxelles. Retrieved 16 February 2020.
  40. ^ Staszczak, A.; Baran, A.; Nazarewicz, W. (2013). "Spontaneous fission modes and lifetimes of superheavy elements in the nuclear density functional theory". Physical Review C. 87 (2): 024320–1. arXiv:1208.1215. Bibcode:2013PhRvC..87b4320S. doi:10.1103/physrevc.87.024320. ISSN 0556-2813.
  41. ^ Audi et al. 2017, pp. 030001-129–030001-138.
  42. ^ Beiser 2003, p. 439.
  43. ^ a b Beiser 2003, p. 433.
  44. ^ Audi et al. 2017, p. 030001-125.
  45. ^ Aksenov, N. V.; Steinegger, P.; Abdullin, F. Sh.; et al. (2017). "On the volatility of nihonium (Nh, Z = 113)". The European Physical Journal A. 53 (7): 158. Bibcode:2017EPJA...53..158A. doi:10.1140/epja/i2017-12348-8. ISSN 1434-6001. S2CID 125849923.
  46. ^ Beiser 2003, p. 432–433.
  47. ^ a b c Oganessian, Yu. (2012). "Nuclei in the "Island of Stability" of Superheavy Elements". Journal of Physics: Conference Series. 337 (1): 012005-1–012005-6. Bibcode:2012JPhCS.337a2005O. doi:10.1088/1742-6596/337/1/012005. ISSN 1742-6596.
  48. ^ Moller, P.; Nix, J. R. (1994). Fission properties of the heaviest elements (PDF). Dai 2 Kai Hadoron Tataikei no Simulation Symposium, Tokai-mura, Ibaraki, Japan. University of North Texas. Retrieved 16 February 2020.
  49. ^ a b Oganessian, Yu. Ts. (2004). "Superheavy elements". Physics World. 17 (7): 25–29. doi:10.1088/2058-7058/17/7/31. Retrieved 16 February 2020.
  50. ^ Schädel, M. (2015). "Chemistry of the superheavy elements". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 373 (2037): 20140191. Bibcode:2015RSPTA.37340191S. doi:10.1098/rsta.2014.0191. ISSN 1364-503X. PMID 25666065.
  51. ^ Hulet, E. K. (1989). Biomodal spontaneous fission. 50th Anniversary of Nuclear Fission, Leningrad, USSR. Bibcode:1989nufi.rept...16H.
  52. ^ Oganessian, Yu. Ts.; Rykaczewski, K. P. (2015). "A beachhead on the island of stability". Physics Today. 68 (8): 32–38. Bibcode:2015PhT....68h..32O. doi:10.1063/PT.3.2880. ISSN 0031-9228. OSTI 1337838. S2CID 119531411.
  53. ^ Grant, A. (2018). "Weighing the heaviest elements". Physics Today. doi:10.1063/PT.6.1.20181113a. S2CID 239775403.
  54. ^ Howes, L. (2019). "Exploring the superheavy elements at the end of the periodic table". Chemical & Engineering News. Retrieved 27 January 2020.
  55. ^ a b Robinson, A. E. (2019). "The Transfermium Wars: Scientific Brawling and Name-Calling during the Cold War". Distillations. Retrieved 22 February 2020.
  56. ^ "Популярная библиотека химических элементов. Сиборгий (экавольфрам)" [Popular library of chemical elements. Seaborgium (eka-tungsten)]. n-t.ru (in Russian). Retrieved 7 January 2020. Reprinted from "Экавольфрам" [Eka-tungsten]. Популярная библиотека химических элементов. Серебро – Нильсборий и далее [Popular library of chemical elements. Silver through nielsbohrium and beyond] (in Russian). Nauka. 1977.
  57. ^ "Nobelium - Element information, properties and uses | Periodic Table". Royal Society of Chemistry. Retrieved 1 March 2020.
  58. ^ a b Kragh 2018, pp. 38–39.
  59. ^ Kragh 2018, p. 40.
  60. ^ a b Ghiorso, A.; Seaborg, G. T.; Oganessian, Yu. Ts.; et al. (1993). "Responses on the report 'Discovery of the Transfermium elements' followed by reply to the responses by Transfermium Working Group" (PDF). Pure and Applied Chemistry. 65 (8): 1815–1824. doi:10.1351/pac199365081815. S2CID 95069384. (PDF) from the original on 25 November 2013. Retrieved 7 September 2016.
  61. ^ Commission on Nomenclature of Inorganic Chemistry (1997). "Names and symbols of transfermium elements (IUPAC Recommendations 1997)" (PDF). Pure and Applied Chemistry. 69 (12): 2471–2474. doi:10.1351/pac199769122471.
  62. ^ a b c d e Sacks, O. (8 February 2004). "Greetings From the Island of Stability". The New York Times.
  63. ^ Bemis, C.E.; Nix, J.R. (1977). "Superheavy elements - the quest in perspective" (PDF). Comments on Nuclear and Particle Physics. 7 (3): 65–78. ISSN 0010-2709.
  64. ^ Emsley, John (2011). Nature's Building Blocks: An A-Z Guide to the Elements (New ed.). New York, NY: Oxford University Press. p. 580. ISBN 978-0-19-960563-7.
  65. ^ Hoffman, D.C; Ghiorso, A.; Seaborg, G.T. (2000). The Transuranium People: The Inside Story. Imperial College Press. Bibcode:2000tpis.book.....H. ISBN 978-1-86094-087-3.
  66. ^ Epherre, M.; Stephan, C. (1975). "Les éléments superlourds" (PDF). Le Journal de Physique Colloques (in French). 11 (36): C5–159–164. doi:10.1051/jphyscol:1975541.
  67. ^ a b c d e f g h Kratz, J. V. (5 September 2011). The Impact of Superheavy Elements on the Chemical and Physical Sciences (PDF). 4th International Conference on the Chemistry and Physics of the Transactinide Elements. Retrieved 27 August 2013.
  68. ^ Chapman, Kit (30 November 2016). "What it takes to make a new element". Chemistry World. Royal Society of Chemistry. Retrieved 3 December 2016.
  69. ^ a b Oganessian, Yu. Ts.; et al. (1999). (PDF). Physical Review Letters. 83 (16): 3154. Bibcode:1999PhRvL..83.3154O. doi:10.1103/PhysRevLett.83.3154. Archived from the original (PDF) on 30 July 2020. Retrieved 28 August 2013.
  70. ^ a b Oganessian, Yu. Ts.; et al. (2000). "Synthesis of superheavy nuclei in the 48Ca + 244Pu reaction: 288114" (PDF). Physical Review C. 62 (4): 041604. Bibcode:2000PhRvC..62d1604O. doi:10.1103/PhysRevC.62.041604.
  71. ^ Oganessian, Yu. Ts.; et al. (2004). (PDF). Physical Review C. 70 (6): 064609. Bibcode:2004PhRvC..70f4609O. doi:10.1103/PhysRevC.70.064609. Archived from the original (PDF) on 28 May 2008.
  72. ^ a b c Browne, M. W. (27 February 1999). . The New York Times. Archived from the original on 22 May 2013. Retrieved 26 August 2013.
  73. ^ Oganessian, Yu. Ts.; et al. (1999). "Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca". Nature. 400 (6741): 242. Bibcode:1999Natur.400..242O. doi:10.1038/22281. S2CID 4399615.
  74. ^ a b Oganessian, Yu. Ts.; et al. (2004). "Measurements of cross sections for the fusion-evaporation reactions 244Pu(48Ca,xn)292−x114 and 245Cm(48Ca,xn)293−x116". Physical Review C. 69 (5): 054607. Bibcode:2004PhRvC..69e4607O. doi:10.1103/PhysRevC.69.054607.
  75. ^ Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Münzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G.; Dahl, L.; Eberhardt, K.; Grzywacz, R.; Hamilton, J. H.; Henderson, R. A.; Kenneally, J. M.; Kindler, B.; Kojouharov, I.; Lang, R.; Lommel, B.; Miernik, K.; Miller, D.; Moody, K. J.; Morita, K.; Nishio, K.; Popeko, A. G.; Roberto, J. B.; Runke, J.; Rykaczewski, K. P.; Saro, S.; Schneidenberger, C.; Schött, H. J.; Shaughnessy, D. A.; Stoyer, M. A.; Thörle-Pospiech, P.; Tinschert, K.; Trautmann, N.; Uusitalo, J.; Yeremin, A. V. (2016). "Remarks on the Fission Barriers of SHN and Search for Element 120". In Peninozhkevich, Yu. E.; Sobolev, Yu. G. (eds.). Exotic Nuclei: EXON-2016 Proceedings of the International Symposium on Exotic Nuclei. Exotic Nuclei. pp. 155–164. ISBN 9789813226555.
  76. ^ Barber, R. C.; Gäggeler, H. W.; Karol, P. J.; Nakahara, H.; Vardaci, E.; Vogt, E. (2009). "Discovery of the element with atomic number 112 (IUPAC Technical Report)" (PDF). Pure and Applied Chemistry. 81 (7): 1331. doi:10.1351/PAC-REP-08-03-05. S2CID 95703833.
  77. ^ Barber, R. C.; Karol, P. J.; Nakahara, H.; Vardaci, E.; Vogt, E. W. (2011). "Discovery of the elements with atomic numbers greater than or equal to 113 (IUPAC Technical Report)". Pure and Applied Chemistry. 83 (7): 1485. doi:10.1351/PAC-REP-10-05-01.
  78. ^ a b Oganessian, Y.T. (2015). "Super-heavy element research". Reports on Progress in Physics. 78 (3): 036301. Bibcode:2015RPPh...78c6301O. doi:10.1088/0034-4885/78/3/036301. PMID 25746203. S2CID 37779526.
  79. ^ Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.
  80. ^ Forsberg, U.; Rudolph, D.; Fahlander, C.; Golubev, P.; Sarmiento, L. G.; Åberg, S.; Block, M.; Düllmann, Ch. E.; Heßberger, F. P.; Kratz, J. V.; Yakushev, Alexander (9 July 2016). "A new assessment of the alleged link between element 115 and element 117 decay chains" (PDF). Physics Letters B. 760 (2016): 293–6. Bibcode:2016PhLB..760..293F. doi:10.1016/j.physletb.2016.07.008. Retrieved 2 April 2016.
  81. ^ Forsberg, Ulrika; Fahlander, Claes; Rudolph, Dirk (2016). Congruence of decay chains of elements 113, 115, and 117 (PDF). Nobel Symposium NS160 – Chemistry and Physics of Heavy and Superheavy Elements. doi:10.1051/epjconf/201613102003.
  82. ^ Morita, Kōsuke (2014). "Research on Superheavy Elements at RIKEN" (PDF). APS Division of Nuclear Physics Meeting Abstracts. 2014: DG.002. Bibcode:2014APS..DNP.DG002M. Retrieved 28 April 2017.
  83. ^ Morimoto, Kouji (October 2009). (PDF). www.kernchemie.uni-mainz.de. University of Mainz. Archived from the original (PDF) on 21 September 2017. Retrieved 28 April 2017.
  84. ^ a b c d e f g h i Zagrebaev, Valeriy; Karpov, Alexander; Greiner, Walter (2013). "Future of superheavy element research: Which nuclei could be synthesized within the next few years?" (PDF). Journal of Physics: Conference Series. Vol. 420. IOP Science. pp. 1–15. Retrieved 20 August 2013.
  85. ^ Heinz, Sophie (1 April 2015). "Probing the Stability of Superheavy Nuclei with Radioactive Ion Beams" (PDF). cyclotron.tamu.edu. Texas A & M University. Retrieved 30 April 2017.
  86. ^ Chatt, J. (1979). "Recommendations for the naming of elements of atomic numbers greater than 100". Pure and Applied Chemistry. 51 (2): 381–384. doi:10.1351/pac197951020381.
  87. ^ Koppenol, W. H. (2002). "Naming of new elements (IUPAC Recommendations 2002)" (PDF). Pure and Applied Chemistry. 74 (5): 787. doi:10.1351/pac200274050787. S2CID 95859397.
  88. ^ Brown, M. (6 June 2011). "Two Ultraheavy Elements Added to Periodic Table". Wired. Retrieved 7 June 2011.
  89. ^ a b Welsh, J. (2 December 2011). "Two Elements Named: Livermorium and Flerovium". LiveScience. Retrieved 2 December 2011.
  90. ^ "Российские физики предложат назвать 116 химический элемент московием" [Russian physicists have offered to call 116 chemical element moscovium]. RIA Novosti. 26 March 2011. Retrieved 8 May 2011. Mikhail Itkis, the vice-director of JINR, stated: "We would like to name element 114 after Georgy Flerov – flerovium, and the second [element 116] – moscovium, not after Moscow, but after Moscow Oblast".
  91. ^ Popeko, Andrey G. (2016). (PDF). jinr.ru. Joint Institute for Nuclear Research. Archived from the original (PDF) on 4 February 2018. Retrieved 4 February 2018.
  92. ^ Oganessian, Yu. Ts. (10 October 2015). "Гамбургский счет" [Hamburg reckoning] (Interview) (in Russian). Interviewed by Orlova, O. Public Television of Russia. Archived from the original on 17 November 2021. Retrieved 18 January 2020.
  93. ^ Subramanian, S. "Making New Elements Doesn't Pay. Just Ask This Berkeley Scientist". Bloomberg Businessweek. Retrieved 18 January 2020.
  94. ^ a b c d e f g h i j k l m Fricke, B.; Greiner, W.; Waber, J. T. (1971). "The continuation of the periodic table up to Z = 172. The chemistry of superheavy elements" (PDF). Theoretica Chimica Acta. 21 (3): 235–260. doi:10.1007/BF01172015. S2CID 117157377.
  95. ^ Kalinkin, B. N.; Gareev, F. A. (2001). Synthesis of Superheavy elements and Theory of Atomic Nucleus. p. 118. arXiv:nucl-th/0111083v2. Bibcode:2002exnu.conf..118K. CiteSeerX 10.1.1.264.7426. doi:10.1142/9789812777300_0009. ISBN 978-981-238-025-8. S2CID 119481840. {{cite book}}: |journal= ignored (help)
  96. ^ a b "JINR Annual Reports 2000–2006". JINR. Retrieved 27 August 2013.
  97. ^ a b Emsley, John (2011). Nature's Building Blocks: An A-Z Guide to the Elements (New ed.). New York, NY: Oxford University Press. p. 590. ISBN 978-0-19-960563-7.
  98. ^ a b c Zagrebaev, V.; Greiner, W. (2008). "Synthesis of superheavy nuclei: A search for new production reactions". Physical Review C. 78 (3): 034610. arXiv:0807.2537. Bibcode:2008PhRvC..78c4610Z. doi:10.1103/PhysRevC.78.034610.
  99. ^ Chowdhury, P. R.; Samanta, C.; Basu, D. N. (2006). "α decay half-lives of new superheavy elements". Physical Review C. 73 (1): 014612. arXiv:nucl-th/0507054. Bibcode:2006PhRvC..73a4612C. doi:10.1103/PhysRevC.73.014612. S2CID 118739116.
  100. ^ Samanta, C.; Chowdhury, P. R.; Basu, D. N. (2007). "Predictions of alpha decay half lives of heavy and superheavy elements". Nuclear Physics A. 789 (1–4): 142–154. arXiv:nucl-th/0703086. Bibcode:2007NuPhA.789..142S. CiteSeerX 10.1.1.264.8177. doi:10.1016/j.nuclphysa.2007.04.001. S2CID 7496348.
  101. ^ Chowdhury, P. R.; Samanta, C.; Basu, D. N. (2008). "Search for long lived heaviest nuclei beyond the valley of stability". Physical Review C. 77 (4): 044603. arXiv:0802.3837. Bibcode:2008PhRvC..77d4603C. doi:10.1103/PhysRevC.77.044603. S2CID 119207807.
  102. ^ Roy Chowdhury, P.; Samanta, C.; Basu, D. N. (2008). "Nuclear half-lives for α-radioactivity of elements with 100 ≤ Z ≤ 130". Atomic Data and Nuclear Data Tables. 94 (6): 781–806. arXiv:0802.4161. Bibcode:2008ADNDT..94..781C. doi:10.1016/j.adt.2008.01.003. S2CID 96718440.
  103. ^ Thayer 2010, pp. 63–64.
  104. ^ Faegri, K.; Saue, T. (2001). "Diatomic molecules between very heavy elements of group 13 and group 17: A study of relativistic effects on bonding". Journal of Chemical Physics. 115 (6): 2456. Bibcode:2001JChPh.115.2456F. doi:10.1063/1.1385366.
  105. ^ Thayer 2010, pp. 63–67.
  106. ^ Gong, Sheng; Wu, Wei; Wang, Fancy Qian; Liu, Jie; Zhao, Yu; Shen, Yiheng; Wang, Shuo; Sun, Qiang; Wang, Qian (8 February 2019). "Classifying superheavy elements by machine learning". Physical Review A. 99 (2): 022110–1–7. Bibcode:2019PhRvA..99b2110G. doi:10.1103/PhysRevA.99.022110. hdl:1721.1/120709. S2CID 126792685.
  107. ^ Mewes, Jan-Michael; Schwerdtfeger, Peter (11 February 2021). "Exclusively Relativistic: Periodic Trends in the Melting and Boiling Points of Group 12". Angewandte Chemie. 60 (14): 7703–7709. doi:10.1002/anie.202100486. PMC 8048430. PMID 33576164.
  108. ^ Borschevsky, Anastasia; Pershina, Valeria; Kaldor, Uzi; Eliav, Ephraim. (PDF). www.kernchemie.uni-mainz.de. Johannes Gutenberg University Mainz. Archived from the original (PDF) on 15 January 2018. Retrieved 15 January 2018.
  109. ^ Hermann, Andreas; Furthmüller, Jürgen; Gäggeler, Heinz W.; Schwerdtfeger, Peter (2010). "Spin-orbit effects in structural and electronic properties for the solid state of the group-14 elements from carbon to superheavy element 114". Physical Review B. 82 (15): 155116–1–8. Bibcode:2010PhRvB..82o5116H. doi:10.1103/PhysRevB.82.155116.
  110. ^ Maiz Hadj Ahmed, H.; Zaoui, A.; Ferhat, M. (2017). "Revisiting the ground state phase stability of super-heavy element Flerovium". Cogent Physics. 4 (1). Bibcode:2017CogPh...4m8045M. doi:10.1080/23311940.2017.1380454. S2CID 125920084.
  111. ^ a b Thayer 2010, pp. 64.
  112. ^ Zaitsevskii, A.; van Wüllen, C.; Rusakov, A.; Titov, A. (September 2007). "Relativistic DFT and ab initio calculations on the seventh-row superheavy elements: E113 - E114" (PDF). jinr.ru. Retrieved 17 February 2018.
  113. ^ a b Pershina 2010, p. 502.
  114. ^ Pershina 2010, p. 503.
  115. ^ a b Thayer 2010, p. 83.
  116. ^ Balasubramanian, K. (30 July 2002). "Breakdown of the singlet and triplet nature of electronic states of the superheavy element 114 dihydride (114H2)". Journal of Chemical Physics. 117 (16): 7426–32. Bibcode:2002JChPh.117.7426B. doi:10.1063/1.1508371.
  117. ^ Winter, M. (2012). "Flerovium: The Essentials". WebElements. University of Sheffield. Retrieved 28 August 2008.
  118. ^ a b c d "Flerov Laboratory of Nuclear Reactions" (PDF). 2009. pp. 86–96. Retrieved 1 June 2012.
  119. ^ a b c d Eichler, Robert; Aksenov, N. V.; Albin, Yu. V.; Belozerov, A. V.; Bozhikov, G. A.; Chepigin, V. I.; Dmitriev, S. N.; Dressler, R.; Gäggeler, H. W.; Gorshkov, V. A.; Henderson, G. S. (2010). "Indication for a volatile element 114" (PDF). Radiochimica Acta. 98 (3): 133–139. doi:10.1524/ract.2010.1705. S2CID 95172228.
  120. ^ Kratz, Jens Volker (2012). "The impact of the properties of the heaviest elements on the chemical and physical sciences". Radiochimica Acta. 100 (8–9): 569–578. doi:10.1524/ract.2012.1963. S2CID 97915854.
  121. ^ Düllmann, Christoph E. (18 September 2012). . Archived from the original on 27 September 2013. Retrieved 25 September 2013.
  122. ^ Yakushev, Alexander; Gates, Jacklyn M.; Türler, Andreas; Schädel, Matthias; Düllmann, Christoph E.; Ackermann, Dieter; Andersson, Lise-Lotte; Block, Michael; Brüchle, Willy; Dvorak, Jan; Eberhardt, Klaus; Essel, Hans G.; Even, Julia; Forsberg, Ulrika; Gorshkov, Alexander; Graeger, Reimar; Gregorich, Kenneth E.; Hartmann, Willi; Herzberg, Rolf-Deitmar; Heßberger, Fritz P.; Hild, Daniel; Hübner, Annett; Jäger, Egon; Khuyagbaatar, Jadambaa; Kindler, Birgit; Kratz, Jens V.; Krier, Jörg; Kurz, Nikolaus; Lommel, Bettina; Niewisch, Lorenz J.; Nitsche, Heino; Omtvedt, Jon Petter; Parr, Edward; Qin, Zhi; Rudolph, Dirk; Runke, Jörg; Schausten, Birgitta; Schimpf, Erwin; Semchenkov, Andrey; Steiner, Jutta; Thörle-Pospiech, Petra; Uusitalo, Juha; Wegrzecki, Maciej; Wiehl, Norbert (2014). "Superheavy Element Flerovium (Element 114) Is a Volatile Metal" (PDF). Inorg. Chem. 53 (1624): 1624–1629. doi:10.1021/ic4026766. PMID 24456007. S2CID 5140723. Retrieved 30 March 2017.
  123. ^ Yakushev, Alexander; Eichler, Robert (2016). Gas-phase chemistry of element 114, flerovium (PDF). Nobel Symposium NS160 – Chemistry and Physics of Heavy and Superheavy Elements. doi:10.1051/epjconf/201613107003.
  124. ^ Moody, Ken (30 November 2013). "Synthesis of Superheavy Elements". In Schädel, Matthias; Shaughnessy, Dawn (eds.). The Chemistry of Superheavy Elements (2nd ed.). Springer Science & Business Media. pp. 24–8. ISBN 9783642374661.
  125. ^ Ingo, Peter (15 September 2022). "Study shows flerovium is the most volatile metal in the periodic table". phys.org. Retrieved 22 November 2022.
  126. ^ Yakushev, A.; Lens, L.; Düllmann, Ch. E.; et al. (25 August 2022). "On the adsorption and reactivity of element 114, flerovium". Frontiers in Chemistry. 10 (976635): 976635. Bibcode:2022FrCh...10.6635Y. doi:10.3389/fchem.2022.976635. PMC 9453156. PMID 36092655.

Bibliography edit

  • Audi, G.; Kondev, F. G.; Wang, M.; et al. (2017). "The NUBASE2016 evaluation of nuclear properties". Chinese Physics C. 41 (3). 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.


     pp. 030001-1–030001-17, pp. 030001-18–030001-138, Table I. The NUBASE2016 table of nuclear and decay properties

  • Thayer, J. S. (2010). "Relativistic Effects and the Chemistry of the Heavier Main Group Elements". Relativistic Methods for Chemists. Challenges and Advances in Computational Chemistry and Physics. Vol. 10. pp. 63–97. doi:10.1007/978-1-4020-9975-5_2. ISBN 978-1-4020-9974-8.
  • Stysziński, J. (2010). Why do we need relativistic computational methods?. p. 99.
  • Pershina, V. (2010). Electronic structure and chemistry of the heaviest elements. p. 450.

External links edit

 
Wikimedia Commons has media related to Flerovium.

February 15, 2024
flerovium, superheavy, synthetic, chemical, element, symbol, atomic, number, extremely, radioactive, synthetic, element, named, after, flerov, laboratory, nuclear, reactions, joint, institute, nuclear, research, dubna, russia, where, element, discovered, 1999,. Flerovium is a superheavy synthetic chemical element it has symbol Fl and atomic number 114 It is an extremely radioactive synthetic element named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna Russia where the element was discovered in 1999 The lab s name in turn honours Russian physicist Georgy Flyorov Flyorov in Cyrillic hence the transliteration of yo to e IUPAC adopted the name on 30 May 2012 The name and symbol had previously been proposed for element 102 nobelium but was not accepted by IUPAC at that time Flerovium 114FlFleroviumPronunciation f l e ˈ r oʊ v i e m 1 fle ROH vee em f l ɛ ˈ r oʊ v i e m 2 flerr OH vee em Mass number 289 unconfirmed 290 Flerovium in the periodic tableHydrogen HeliumLithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine NeonSodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine ArgonPotassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine KryptonRubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine XenonCaesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury element Thallium Lead Bismuth Polonium Astatine RadonFrancium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Pb Fl Uho nihonium flerovium moscoviumAtomic number Z 114Groupgroup 14 carbon group Periodperiod 7Block p blockElectron configuration Rn 5f14 6d10 7s2 7p2 predicted 3 Electrons per shell2 8 18 32 32 18 4 predicted Physical propertiesPhase at STPliquid predicted 4 Melting point284 50 K 11 50 C 52 90 F predicted 4 Density near r t 11 4 0 3 g cm3 predicted 4 Heat of vaporization38 kJ mol predicted 5 Atomic propertiesOxidation states 0 1 2 4 6 predicted 3 5 6 Ionization energies1st 832 2 kJ mol predicted 7 2nd 1600 kJ mol predicted 5 3rd 3370 kJ mol predicted 5 more Atomic radiusempirical 180 pm predicted 3 5 Covalent radius171 177 pm extrapolated 8 Other propertiesNatural occurrencesyntheticCAS Number54085 16 4HistoryNamingafter Joint Institute for Nuclear Research itself named after Georgy Flyorov 9 DiscoveryJoint Institute for Nuclear Research JINR and Lawrence Livermore National Laboratory LLNL 1999 Isotopes of fleroviumveMain isotopes Decayabun dance half life t1 2 mode pro duct284Fl synth 2 5 ms 10 11 SF 285Fl synth 100 ms 12 a 281Cn286Fl synth 105 ms 13 a 55 282CnSF 45 287Fl synth 360 ms 13 a 283Cne 14 287Nh288Fl synth 653 ms a 284Cn289Fl synth 2 1 s a 285Cn290Fl synth 19 s 15 16 EC 290Nha 286Cn Category Fleroviumviewtalkedit referencesIt is a transactinide in the p block of the periodic table It is in period 7 the heaviest known member of the carbon group and the last element whose chemistry has been investigated Initial chemical studies in 2007 2008 indicated that flerovium was unexpectedly volatile for a group 14 element 17 in preliminary results it even seemed to exhibit properties similar to noble gases 18 More recent results show that flerovium s reaction with gold is similar to that of copernicium showing it is very volatile and may even be gaseous at standard temperature and pressure that it would show metallic properties consistent with being the heavier homologue of lead and that it would be the least reactive metal in group 14 Whether flerovium behaves more like a metal or a noble gas is still unresolved as of 2023 it might also be a semiconductor Very little is known about flerovium as it can only be produced one atom at a time either through direct synthesis or through radioactive decay of even heavier elements and all known isotopes are short lived Six isotopes of flerovium are known ranging in mass number between 284 and 289 the most stable of these 289Fl has a half life of 1 9 seconds but the unconfirmed 290Fl may have a longer half life of 19 seconds which would be one of the longest half lives of any nuclide in these farthest reaches of the periodic table Flerovium is predicted to be near the centre of the theorized island of stability and it is expected that heavier flerovium isotopes especially the possibly magic 298Fl may have even longer half lives Contents 1 Introduction 1 1 Synthesis of superheavy nuclei 1 2 Decay and detection 2 History 2 1 Pre discovery 2 2 First signs 2 3 Confirmed discovery 2 4 Isotopes 2 5 Naming 3 Predicted properties 3 1 Nuclear stability and isotopes 3 2 Atomic and physical 3 3 Chemical 4 Experimental chemistry 5 See also 6 Notes 7 References 8 Bibliography 9 External linksIntroduction editThis section is an excerpt from Superheavy element Introduction edit Synthesis of superheavy nuclei edit nbsp A graphic depiction of a nuclear fusion reaction Two nuclei fuse into one emitting a neutron Reactions that created new elements to this moment were similar with the only possible difference that several singular neutrons sometimes were released or none at all A superheavy a atomic nucleus is created in a nuclear reaction that combines two other nuclei of unequal size b into one roughly the more unequal the two nuclei in terms of mass the greater the possibility that the two react 24 The material made of the heavier nuclei is made into a target which is then bombarded by the beam of lighter nuclei Two nuclei can only fuse into one if they approach each other closely enough normally nuclei all positively charged repel each other due to electrostatic repulsion The strong interaction can overcome this repulsion but only within a very short distance from a nucleus beam nuclei are thus greatly accelerated in order to make such repulsion insignificant compared to the velocity of the beam nucleus 25 The energy applied to the beam nuclei to accelerate them can cause them to reach speeds as high as one tenth of the speed of light However if too much energy is applied the beam nucleus can fall apart 25 Coming close enough alone is not enough for two nuclei to fuse when two nuclei approach each other they usually remain together for approximately 10 20 seconds and then part ways not necessarily in the same composition as before the reaction rather than form a single nucleus 25 26 This happens because during the attempted formation of a single nucleus electrostatic repulsion tears apart the nucleus that is being formed 25 Each pair of a target and a beam is characterized by its cross section the probability that fusion will occur if two nuclei approach one another expressed in terms of the transverse area that the incident particle must hit in order for the fusion to occur c This fusion may occur as a result of the quantum effect in which nuclei can tunnel through electrostatic repulsion If the two nuclei can stay close for past that phase multiple nuclear interactions result in redistribution of energy and an energy equilibrium 25 External videos nbsp Visualization of unsuccessful nuclear fusion based on calculations from the Australian National University 28 The resulting merger is an excited state 29 termed a compound nucleus and thus it is very unstable 25 To reach a more stable state the temporary merger may fission without formation of a more stable nucleus 30 Alternatively the compound nucleus may eject a few neutrons which would carry away the excitation energy if the latter is not sufficient for a neutron expulsion the merger would produce a gamma ray This happens in approximately 10 16 seconds after the initial nuclear collision and results in creation of a more stable nucleus 30 The definition by the IUPAC IUPAP Joint Working Party JWP states that a chemical element can only be recognized as discovered if a nucleus of it has not decayed within 10 14 seconds This value was chosen as an estimate of how long it takes a nucleus to acquire its outer electrons and thus display its chemical properties 31 d Decay and detection edit The beam passes through the target and reaches the next chamber the separator if a new nucleus is produced it is carried with this beam 33 In the separator the newly produced nucleus is separated from other nuclides that of the original beam and any other reaction products e and transferred to a surface barrier detector which stops the nucleus The exact location of the upcoming impact on the detector is marked also marked are its energy and the time of the arrival 33 The transfer takes about 10 6 seconds in order to be detected the nucleus must survive this long 36 The nucleus is recorded again once its decay is registered and the location the energy and the time of the decay are measured 33 Stability of a nucleus is provided by the strong interaction However its range is very short as nuclei become larger its influence on the outermost nucleons protons and neutrons weakens At the same time the nucleus is torn apart by electrostatic repulsion between protons and its range is not limited 37 Total binding energy provided by the strong interaction increases linearly with the number of nucleons whereas electrostatic repulsion increases with the square of the atomic number i e the latter grows faster and becomes increasingly important for heavy and superheavy nuclei 38 39 Superheavy nuclei are thus theoretically predicted 40 and have so far been observed 41 to predominantly decay via decay modes that are caused by such repulsion alpha decay and spontaneous fission f Almost all alpha emitters have over 210 nucleons 43 and the lightest nuclide primarily undergoing spontaneous fission has 238 44 In both decay modes nuclei are inhibited from decaying by corresponding energy barriers for each mode but they can be tunnelled through 38 39 nbsp Scheme of an apparatus for creation of superheavy elements based on the Dubna Gas Filled Recoil Separator set up in the Flerov Laboratory of Nuclear Reactions in JINR The trajectory within the detector and the beam focusing apparatus changes because of a dipole magnet in the former and quadrupole magnets in the latter 45 Alpha particles are commonly produced in radioactive decays because mass of an alpha particle per nucleon is small enough to leave some energy for the alpha particle to be used as kinetic energy to leave the nucleus 46 Spontaneous fission is caused by electrostatic repulsion tearing the nucleus apart and produces various nuclei in different instances of identical nuclei fissioning 39 As the atomic number increases spontaneous fission rapidly becomes more important spontaneous fission partial half lives decrease by 23 orders of magnitude from uranium element 92 to nobelium element 102 47 and by 30 orders of magnitude from thorium element 90 to fermium element 100 48 The earlier liquid drop model thus suggested that spontaneous fission would occur nearly instantly due to disappearance of the fission barrier for nuclei with about 280 nucleons 39 49 The later nuclear shell model suggested that nuclei with about 300 nucleons would form an island of stability in which nuclei will be more resistant to spontaneous fission and will primarily undergo alpha decay with longer half lives 39 49 Subsequent discoveries suggested that the predicted island might be further than originally anticipated they also showed that nuclei intermediate between the long lived actinides and the predicted island are deformed and gain additional stability from shell effects 50 Experiments on lighter superheavy nuclei 51 as well as those closer to the expected island 47 have shown greater than previously anticipated stability against spontaneous fission showing the importance of shell effects on nuclei g Alpha decays are registered by the emitted alpha particles and the decay products are easy to determine before the actual decay if such a decay or a series of consecutive decays produces a known nucleus the original product of a reaction can be easily determined h That all decays within a decay chain were indeed related to each other is established by the location of these decays which must be in the same place 33 The known nucleus can be recognized by the specific characteristics of decay it undergoes such as decay energy or more specifically the kinetic energy of the emitted particle i Spontaneous fission however produces various nuclei as products so the original nuclide cannot be determined from its daughters j The information available to physicists aiming to synthesize a superheavy element is thus the information collected at the detectors location energy and time of arrival of a particle to the detector and those of its decay The physicists analyze this data and seek to conclude that it was indeed caused by a new element and could not have been caused by a different nuclide than the one claimed Often provided data is insufficient for a conclusion that a new element was definitely created and there is no other explanation for the observed effects errors in interpreting data have been made k History editSee also Discovery of the chemical elements Pre discovery edit In the late 1940s to early 1960s the early days of making heavier and heavier transuranic elements it was predicted that since such elements did not occur naturally they would have shorter and shorter spontaneous fission half lives until they stopped existing altogether around element 108 now called hassium Initial work in synthesizing the heavier actinides seemed to confirm this 62 But the nuclear shell model introduced in 1949 and extensively developed in the late 1960s by William Myers and Wladyslaw Swiatecki stated that protons and neutrons form shells within a nucleus analogous to electron shells Noble gases are unreactive due to a full electron shell similarly it was theorized that elements with full nuclear shells those having magic numbers of protons or neutrons would be stabilized against decay A doubly magic isotope with magic numbers of both protons and neutrons would be especially stabilized Heiner Meldner calculated in 1965 that the next doubly magic isotope after 208Pb was 298Fl with 114 protons and 184 neutrons which would be the centre of an island of stability 62 63 This island of stability supposedly from copernicium Z 112 to oganesson Z 118 would come after a long sea of instability from mendelevium Z 101 to roentgenium Z 111 62 and the flerovium isotopes in it were speculated in 1966 to have half lives over 108 years 64 These early predictions fascinated researchers and led to the first attempt to make flerovium in 1968 with the reaction 248Cm 40Ar xn No flerovium atoms were detected this was thought to be because the compound nucleus 288Fl only has 174 neutrons instead of the supposed magic 184 and this would have significant impact on the reaction cross section yield and half lives of nuclei produced 65 66 It was then 30 more years before flerovium was first made 62 Later work suggests the islands of stability around hassium and flerovium occur because these nuclei are respectively deformed and oblate which make them resistant to spontaneous fission and that the true island of stability for spherical nuclei occurs at around unbibium 306 122 protons 184 neutrons 67 First signs edit The first sign of flerovium was found in December 1998 by a team of scientists at Joint Institute for Nuclear Research JINR Dubna Russia led by Yuri Oganessian who bombarded a target of plutonium 244 with accelerated nuclei of calcium 48 24494 Pu 4820 Ca 292114 Fl 290114 Fl 2 10 nThis reaction had been tried before without success for this 1998 attempt JINR had upgraded all of its equipment to detect and separate the produced atoms better and bombard the target more intensely 68 One atom of flerovium alpha decaying with lifetime 30 4 s was detected The decay energy measured was 9 71 MeV giving an expected half life of 2 23 s 69 This observation was assigned to 289Fl and was published in January 1999 69 The experiment was later repeated but an isotope with these decay properties was never observed again so the exact identity of this activity is unknown It may have been due to the isomer 289mFl 70 71 but because the presence of a whole series of longer lived isomers in its decay chain would be rather doubtful the most likely assignment of this chain is to the 2n channel leading to 290Fl and electron capture to 290Nh This fits well with the systematics and trends of flerovium isotopes and is consistent with the low beam energy chosen for that experiment though further confirmation would be desirable via synthesis of 294Lv in a 248Cm 48Ca 2n reaction which would alpha decay to 290Fl 15 The RIKEN team reported possible synthesis of isotopes 294Lv and 290Fl in 2016 in a 248Cm 48Ca 2n reaction but the alpha decay of 294Lv was missed alpha decay of 290Fl to 286Cn was observed instead of electron capture to 290Nh and the assignment to 294Lv instead of 293Lv was not certain 16 Glenn T Seaborg a scientist at Lawrence Berkeley National Laboratory who had been involved in work to make such superheavy elements had said in December 1997 that one of his longest lasting and most cherished dreams was to see one of these magic elements 62 he was told of the synthesis of flerovium by his colleague Albert Ghiorso soon after its publication in 1999 Ghiorso later recalled 72 I wanted Glenn to know so I went to his bedside and told him I thought I saw a gleam in his eye but the next day when I went to visit him he didn t remember seeing me As a scientist he had died when he had that stroke 72 Albert Ghiorso Seaborg died two months later on 25 February 1999 72 In March 1999 the same team replaced the 244Pu target with 242Pu to make other flerovium isotopes Two atoms of flerovium were produced as a result each alpha decaying with a half life of 5 5 s They were assigned as 287Fl 73 This activity has not been seen again either and it is unclear what nucleus was produced It is possible that it was an isomer 287mFl 74 or from electron capture by 287Fl leading to 287Nh and 283Rg 75 Confirmed discovery edit The now confirmed discovery of flerovium was made in June 1999 when the Dubna team repeated the first reaction from 1998 This time two atoms of flerovium were produced they alpha decayed with half life 2 6 s different from the 1998 result 70 This activity was initially assigned to 288Fl in error due to the confusion regarding the previous observations that were assumed to come from 289Fl Further work in December 2002 finally allowed a positive reassignment of the June 1999 atoms to 289Fl 74 In May 2009 the Joint Working Party JWP of IUPAC published a report on the discovery of copernicium in which they acknowledged discovery of the isotope 283Cn 76 This implied the discovery of flerovium from the acknowledgement of the data for the synthesis of 287Fl and 291Lv which decay to 283Cn The discovery of flerovium 286 and 287 was confirmed in January 2009 at Berkeley This was followed by confirmation of flerovium 288 and 289 in July 2009 at Gesellschaft fur Schwerionenforschung GSI in Germany In 2011 IUPAC evaluated the Dubna team s 1999 2007 experiments They found the early data inconclusive but accepted the results of 2004 2007 as flerovium and the element was officially recognized as having been discovered 77 Isotopes edit Main article Isotopes of flerovium List of flerovium isotopes vte Isotope Half life l Decaymode Discoveryyear DiscoveryreactionValue ref284Fl 2 5 ms 11 SF 2015 240Pu 48Ca 4n 239Pu 48Ca 3n 285Fl 100 ms 12 a 2010 242Pu 48Ca 5n 286Fl 105 ms 13 a SF 2003 290Lv a 287Fl 360 ms 13 a EC 2003 244Pu 48Ca 5n 288Fl 660 ms 78 a 2004 244Pu 48Ca 4n 289Fl 1 9 s 78 a 1999 244Pu 48Ca 3n 289mFl m 1 1 s 79 a 2012 293mLv a 290Fl m 19 s 15 16 a EC 1998 244Pu 48Ca 2n While the method of chemical characterization of a daughter was successful for flerovium and livermorium and the simpler structure of even even nuclei made confirmation of oganesson Z 118 straightforward there have been difficulties in establishing the congruence of decay chains from isotopes with odd protons odd neutrons or both 80 81 To get around this problem with hot fusion the decay chains from which terminate in spontaneous fission instead of connecting to known nuclei as cold fusion allows experiments were done in Dubna in 2015 to produce lighter isotopes of flerovium by reaction of 48Ca with 239Pu and 240Pu particularly 283Fl 284Fl and 285Fl the last had previously been characterized in the 242Pu 48Ca 5n 285Fl reaction at Lawrence Berkeley National Laboratory in 2010 285Fl was more clearly characterized while the new isotope 284Fl was found to undergo immediate spontaneous fission instead of alpha decay to known nuclides around the N 162 shell closure and 283Fl was not found 11 This lightest isotope may yet conceivably be produced in the cold fusion reaction 208Pb 76Ge n 283Fl 15 which the team at RIKEN in Japan has considered investigating 82 83 this reaction is expected to have a higher cross section of 200 fb than the world record low of 30 fb for 209Bi 70Zn n 278Nh the reaction which RIKEN used for the official discovery of element 113 nihonium 15 84 85 The Dubna team repeated their investigation of the 240Pu 48Ca reaction in 2017 observing three new consistent decay chains of 285Fl another decay chain from this nuclide that may pass through some isomeric states in its daughters a chain that could be assigned to 287Fl likely from 242Pu impurities in the target and some spontaneous fissions of which some could be from 284Fl though other interpretations including side reactions involving evaporation of charged particles are also possible 12 Naming edit nbsp Stamp of Russia issued in 2013 dedicated to Georgy Flyorov and fleroviumPer Mendeleev s nomenclature for unnamed and undiscovered elements flerovium is sometimes called eka lead In 1979 IUPAC published recommendations according to which the element was to be called ununquadium symbol Uuq 86 a systematic element name as a placeholder until the discovery of the element is confirmed and a permanent name is decided on Most scientists in the field called it element 114 with the symbol of E114 114 or 114 3 Per IUPAC recommendations the discoverer s of a new element has the right to suggest a name 87 After IUPAC recognized the discovery of flerovium and livermorium on 1 June 2011 IUPAC asked the discovery team at JINR to suggest permanent names for the two elements The Dubna team chose the name flerovium symbol Fl 88 89 after Russia s Flerov Laboratory of Nuclear Reactions FLNR named after Soviet physicist Georgy Flyorov also spelled Flerov earlier reports claim the element name was directly proposed to honour Flyorov 90 In accordance with the proposal received from the discoverers IUPAC officially named flerovium after Flerov Laboratory of Nuclear Reactions not after Flyorov himself 9 Flyorov is known for writing to Joseph Stalin in April 1942 and pointing out the silence in scientific journals in the field of nuclear fission in the United States Great Britain and Germany Flyorov deduced that this research must have become classified information in those countries Flyorov s work and urgings led to the development of the USSR s own atomic bomb project 89 Flyorov is also known for the discovery of spontaneous fission with Konstantin Petrzhak The naming ceremony for flerovium and livermorium was held on 24 October 2012 in Moscow 91 In a 2015 interview with Oganessian the host in preparation to ask a question said You said you had dreamed to name an element after your teacher Georgy Flyorov Without letting the host finish Oganessian repeatedly said I did 92 Predicted properties editVery few properties of flerovium or its compounds have been measured due to its extremely limited and expensive production 93 and the fact that it decays very quickly A few singular properties have been measured but for the most part properties of flerovium remain unknown and only predictions are available Nuclear stability and isotopes edit Main article Isotopes of flerovium nbsp Regions of differently shaped nuclei as predicted by the interacting boson model 67 The basis of the chemical periodicity in the periodic table is the electron shell closure at each noble gas atomic numbers 2 10 18 36 54 86 and 118 as any further electrons must enter a new shell with higher energy closed shell electron configurations are markedly more stable hence the inertness of noble gases 94 Protons and neutrons are also known to form closed nuclear shells so the same happens at nucleon shell closures which happen at specific nucleon numbers often dubbed magic numbers The known magic numbers are 2 8 20 28 50 and 82 for protons and neutrons also 126 for neutrons 94 Nuclei with magic proton and neutron numbers such as helium 4 oxygen 16 calcium 48 and lead 208 are doubly magic and are very stable This stability is very important for superheavy elements with no stabilization half lives would be expected by exponential extrapolation to be nanoseconds at darmstadtium element 110 because the ever increasing electrostatic repulsion between protons overcomes the limited range strong nuclear force that holds nuclei together The next closed nucleon shells magic numbers are thought to denote the centre of the long sought island of stability where half lives to alpha decay and spontaneous fission lengthen again 94 nbsp Orbitals with high azimuthal quantum number are raised in energy eliminating what would otherwise be a gap in orbital energy corresponding to a closed proton shell at element 114 This raises the next proton shell to the region around element 120 67 Initially by analogy with neutron magic number 126 the next proton shell was also expected at element 126 too far beyond the synthesis capabilities of the mid 20th century to get much theoretical attention In 1966 new values for the potential and spin orbit interaction in this region of the periodic table 95 contradicted this and predicted that the next proton shell would instead be at element 114 94 and that nuclei in this region would be relatively stable against spontaneous fission 94 The expected closed neutron shells in this region were at neutron number 184 or 196 making 298Fl and 310Fl candidates for being doubly magic 94 1972 estimates predicted a half life of around 1 year for 298Fl which was expected to be near an island of stability centered near 294Ds with a half life around 1010 years comparable to 232Th 94 After making the first isotopes of elements 112 118 at the turn of the 21st century it was found that these neutron deficient isotopes were stabilized against fission In 2008 it was thus hypothesized that the stabilization against fission of these nuclides was due to their oblate nuclei and that a region of oblate nuclei was centred on 288Fl Also new theoretical models showed that the expected energy gap between the proton orbitals 2f7 2 filled at element 114 and 2f5 2 filled at element 120 was smaller than expected so element 114 no longer appeared to be a stable spherical closed nuclear shell The next doubly magic nucleus is now expected to be around 306Ubb but this nuclide s expected short half life and low production cross section make its synthesis challenging 67 Still the island of stability is expected to exist in this region and nearer its centre which has not been approached closely enough yet some nuclides such as 291Mc and its alpha and beta decay daughters n may be found to decay by positron emission or electron capture and thus move into the centre of the island 84 Due to the expected high fission barriers any nucleus in this island of stability would decay exclusively by alpha decay and perhaps some electron capture and beta decay 94 both of which would bring the nuclei closer to the beta stability line where the island is expected to be Electron capture is needed to reach the island which is problematic because it is not certain that electron capture is a major decay mode in this region of the chart of nuclides 84 Experiments were done in 2000 2004 at Flerov Laboratory of Nuclear Reactions in Dubna studying the fission properties of the compound nucleus 292Fl by bombarding 244Pu with accelerated 48Ca ions 96 A compound nucleus is a loose combination of nucleons that have not yet arranged themselves into nuclear shells It has no internal structure and is held together only by the collision forces between the two nuclei 97 o Results showed how such nuclei fission mainly by expelling doubly magic or nearly doubly magic fragments such as 40Ca 132Sn 208Pb or 209Bi It was also found that 48Ca and 58Fe projectiles had a similar yield for the fusion fission pathway suggesting possible future use of 58Fe projectiles in making superheavy elements 96 It has also been suggested that a neutron rich flerovium isotope can be formed by quasifission partial fusion followed by fission of a massive nucleus 98 Recently it has been shown that multi nucleon transfer reactions in collisions of actinide nuclei such as uranium and curium might be used to make neutron rich superheavy nuclei in the island of stability 98 though production of neutron rich nobelium or seaborgium is more likely 84 Theoretical estimates of alpha decay half lives of flerovium isotopes support the experimental data 99 100 The fission survived isotope 298Fl long expected to be doubly magic is predicted to have alpha decay half life 17 days 101 102 Making 298Fl directly by a fusion evaporation pathway is currently impossible no known combination of target and stable projectile can give 184 neutrons for the compound nucleus and radioactive projectiles such as 50Ca half life 14 s cannot yet be used in the needed quantity and intensity 98 One possibility for making the theorized long lived nuclei of copernicium 291Cn and 293Cn and flerovium near the middle of the island is using even heavier targets such as 250Cm 249Bk 251Cf and 254Es that when fused with 48Ca would yield isotopes such as 291Mc and 291Fl as decay products of 299Uue 295Ts and 295Lv which may have just enough neutrons to alpha decay to nuclides close enough to the centre of the island to possibly undergo electron capture and move inward to the centre However reaction cross sections would be small and little is yet known about the decay properties of superheavies near the beta stability line This may be the current best hope to synthesize nuclei in the island of stability but it is speculative and may or may not work in practice 84 Another possibility is to use controlled nuclear explosions to get the high neutron flux needed to make macroscopic amounts of such isotopes 84 This would mimic the r process where the actinides were first produced in nature and the gap of instability after polonium bypassed as it would bypass the gaps of instability at 258 260Fm and at mass number 275 atomic numbers 104 to 108 84 Some such isotopes especially 291Cn and 293Cn may even have been synthesized in nature but would decay far too quickly with half lives of only thousands of years and be produced in far too small quantities 10 12 the abundance of lead to be detectable today outside cosmic rays 84 Atomic and physical edit Flerovium is in group 14 in the periodic table below carbon silicon germanium tin and lead Every previous group 14 element has 4 electrons in its valence shell hence valence electron configuration ns2np2 For flerovium the trend will continue and the valence electron configuration is predicted as 7s27p2 3 flerovium will be similar to its lighter congeners in many ways Differences are likely to arise a large contributor is spin orbit SO interaction mutual interaction between the electrons motion and spin It is especially strong in superheavy elements because the electrons move faster than in lighter atoms at speeds comparable to the speed of light 103 For flerovium it lowers the 7s and the 7p electron energy levels stabilizing the corresponding electrons but two of the 7p electron energy levels are stabilized more than the other four 104 The stabilization of the 7s electrons is called the inert pair effect and the effect tearing the 7p subshell into the more and less stabilized parts is called subshell splitting Computational chemists see the split as a change of the second azimuthal quantum number ℓ from 1 to 1 2 and 3 2 for the more stabilized and less stabilized parts of the 7p subshell respectively 105 p For many theoretical purposes the valence electron configuration may be represented to reflect the 7p subshell split as 7s2 7p21 2 3 These effects cause flerovium s chemistry to be somewhat different from that of its lighter neighbours Because the spin orbit splitting of the 7p subshell is very large in flerovium and both of flerovium s filled orbitals in the 7th shell are stabilized relativistically the valence electron configuration of flerovium may be considered to have a completely filled shell Its first ionization energy of 8 539 eV 823 9 kJ mol should be the second highest in group 14 3 The 6d electron levels are also destabilized leading to some early speculations that they may be chemically active though newer work suggests this is unlikely 94 Because the first ionization energy is higher than in silicon and germanium though still lower than in carbon it has been suggested that flerovium could be classed as a metalloid 106 Flerovium s closed shell electron configuration means metallic bonding in metallic flerovium is weaker than in the elements before and after so flerovium is expected to have a low boiling point 3 and has recently been suggested to be possibly a gaseous metal similar to predictions for copernicium which also has a closed shell electron configuration 67 Flerovium s melting and boiling points were predicted in the 1970s to be around 70 and 150 C 3 significantly lower than for the lighter group 14 elements lead has 327 and 1749 C and continuing the trend of decreasing boiling points down the group Earlier studies predicted a boiling point of 1000 C or 2840 C 94 but this is now considered unlikely because of the expected weak metallic bonding and that group trends would expect flerovium to have low sublimation enthalpy 3 Preliminary 2021 calculations predicted that flerovium should have melting point 73 C lower than mercury at 39 C and copernicium predicted 10 11 C and boiling point 107 C which would make it a liquid metal 107 Like mercury radon and copernicium but not lead and oganesson eka radon flerovium is calculated to have no electron affinity 108 A 2010 study published calculations predicting a hexagonal close packed crystal structure for flerovium due to spin orbit coupling effects and a density of 9 928 g cm3 though this was noted to be probably slightly too low 109 Newer calculations published in 2017 expected flerovium to crystallize in face centred cubic crystal structure like its lighter congener lead 110 and calculations published in 2022 predicted a density of 11 4 0 3 g cm3 similar to lead 11 34 g cm3 These calculations found that the face centred cubic and hexagonal close packed structures should have nearly the same energy a phenomenon reminiscent of the noble gases These calculations predict that hexagonal close packed flerovium should be a semiconductor with a band gap of 0 8 0 3 eV Copernicium is also predicted to be a semiconductor These calculations predict that the cohesive energy of flerovium should be around 0 5 0 1 eV this is similar to that predicted for oganesson 0 45 eV larger than that predicted for copernicium 0 38 eV but smaller than that of mercury 0 79 eV The melting point was calculated as 284 50 K 11 50 C so that flerovium is probably a liquid at room temperature although the boiling point was not determined 4 The electron of a hydrogen like flerovium ion Fl113 remove all but one electron is expected to move so fast that its mass is 1 79 times that of a stationary electron due to relativistic effects The figures for hydrogen like lead and tin are expected to be 1 25 and 1 073 respectively 111 Flerovium would form weaker metal metal bonds than lead and would be adsorbed less on surfaces 111 Chemical edit Flerovium is the heaviest known member of group 14 below lead and is projected to be the second member of the 7p series of elements Nihonium and flerovium are expected to form a very short subperiod corresponding to the filling of the 7p1 2 orbital coming between the filling of the 6d5 2 and 7p3 2 subshells Their chemical behaviour is expected to be very distinctive nihonium s homology to thallium has been called doubtful by computational chemists while flerovium s to lead has been called only formal 112 The first five group 14 members show a 4 oxidation state and the latter members have increasingly prominent 2 chemistry due to onset of the inert pair effect For tin the 2 and 4 states are similar in stability and lead II is the most stable of all the chemically well understood 2 oxidation states in group 14 3 The 7s orbitals are very highly stabilized in flerovium so a very large sp3 orbital hybridization is needed to achieve a 4 oxidation state so flerovium is expected to be even more stable than lead in its strongly predominant 2 oxidation state and its 4 oxidation state should be highly unstable 3 For example the dioxide FlO2 is expected to be highly unstable to decomposition into its constituent elements and would not be formed by direct reaction of flerovium with oxygen 3 113 and flerovane FlH4 which should have Fl H bond lengths of 1 787 A 6 and would be the heaviest homologue of methane the lighter compounds include silane germane and stannane is predicted to be more thermodynamically unstable than plumbane spontaneously decomposing to flerovium II hydride FlH2 and H2 114 The tetrafluoride FlF4 115 would have bonding mostly due to sd hybridizations rather than sp3 hybridizations 94 and its decomposition to the difluoride and fluorine gas would be exothermic 6 The other tetrahalides for example FlCl4 is destabilized by about 400 kJ mol decompose similarly 6 The corresponding polyfluoride anion FlF2 6 should be unstable to hydrolysis in aqueous solution and flerovium II polyhalide anions such as FlBr 3 and FlI 3 are predicted to form preferentially in solutions 3 The sd hybridizations were suggested in early calculations as flerovium s 7s and 6d electrons share about the same energy which would allow a volatile hexafluoride to form but later calculations do not confirm this possibility 94 In general spin orbit contraction of the 7p1 2 orbital should lead to smaller bond lengths and larger bond angles this has been theoretically confirmed in FlH2 6 Still even FlH2 should be relativistically destabilized by 2 6 eV to below Fl H2 the large spin orbit effects also break down the usual singlet triplet divide in the group 14 dihydrides FlF2 and FlCl2 are predicted to be more stable than FlH2 116 Due to relativistic stabilization of flerovium s 7s27p21 2 valence electron configuration the 0 oxidation state should also be more stable for flerovium than for lead as the 7p1 2 electrons begin to also have a mild inert pair effect 3 this stabilization of the neutral state may bring about some similarities between the behavior of flerovium and the noble gas radon 18 Due to flerovium s expected relative inertness diatomic compounds FlH and FlF should have lower energies of dissociation than the corresponding lead compounds PbH and PbF 6 Flerovium IV should be even more electronegative than lead IV 115 lead IV has electronegativity 2 33 on the Pauling scale though the lead II value is only 1 87 Flerovium could be a noble metal 3 Flerovium II should be more stable than lead II and halides FlX FlX2 FlX 3 and FlX2 4 X Cl Br I are expected to form readily The fluorides would undergo strong hydrolysis in aqueous solution 3 All flerovium dihalides are expected to be stable 3 the difluoride being water soluble 117 Spin orbit effects would destabilize the dihydride FlH2 by almost 2 6 eV 250 kJ mol 113 In aqueous solution the oxyanion flerovite FlO2 2 would also form analogous to plumbite Flerovium II sulfate FlSO4 and sulfide FlS should be very insoluble in water and flerovium II acetate FlC2H3O2 and nitrate Fl NO3 2 should be quite water soluble 94 The standard electrode potential for reduction of Fl2 ion to metallic flerovium is estimated to be around 0 9 V confirming the increased stability of flerovium in the neutral state 3 In general due to relativistic stabilization of the 7p1 2 spinor Fl2 is expected to have properties intermediate between those of Hg2 or Cd2 and its lighter congener Pb2 3 Experimental chemistry editFlerovium is currently the last element whose chemistry has been experimentally investigated though studies so far are not conclusive Two experiments were done in April May 2007 in a joint FLNR PSI collaboration to study copernicium chemistry The first experiment used the reaction 242Pu 48Ca 3n 287Fl and the second 244Pu 48Ca 4n 288Fl these reactions give short lived flerovium isotopes whose copernicium daughters would then be studied 118 Adsorption properties of the resultant atoms on a gold surface were compared to those of radon as it was then expected that copernicium s full shell electron configuration would lead to noble gas like behavior 118 Noble gases interact with metal surfaces very weakly which is uncharacteristic of metals 118 The first experiment found 3 atoms of 283Cn but seemingly also 1 atom of 287Fl This was a surprise transport time for the product atoms is 2 s so the flerovium should have decayed to copernicium before adsorption In the second reaction 2 atoms of 288Fl and possibly 1 of 289Fl were seen Two of the three atoms showed adsorption characteristics associated with a volatile noble gas like element which has been suggested but is not predicted by more recent calculations These experiments gave independent confirmation for the discovery of copernicium flerovium and livermorium via comparison with published decay data Further experiments in 2008 to confirm this important result detected 1 atom of 289Fl and supported previous data showing flerovium had a noble gas like interaction with gold 118 Empirical support for a noble gas like flerovium soon weakened In 2009 and 2010 the FLNR PSI collaboration synthesized more flerovium to follow up their 2007 and 2008 studies In particular the first three flerovium atoms made in the 2010 study suggested again a noble gas like character but the complete set taken together resulted in a more ambiguous interpretation unusual for a metal in the carbon group but not fully like a noble gas in character 119 In their paper the scientists refrained from calling flerovium s chemical properties close to those of noble gases as had previously been done in the 2008 study 119 Flerovium s volatility was again measured through interactions with a gold surface and provided indications that the volatility of flerovium was comparable to that of mercury astatine and the simultaneously investigated copernicium which had been shown in the study to be a very volatile noble metal conforming to its being the heaviest known group 12 element 119 Still it was pointed out that this volatile behavior was not expected for a usual group 14 metal 119 In experiments in 2012 at GSI flerovium s chemistry was found to be more metallic than noble gas like Jens Volker Kratz and Christoph Dullmann specifically named copernicium and flerovium as being in a new category of volatile metals Kratz even speculated that they might be gases at standard temperature and pressure 67 120 These volatile metals as a category were expected to fall between normal metals and noble gases in terms of adsorption properties 67 Contrary to the 2009 and 2010 results it was shown in the 2012 experiments that the interactions of flerovium and copernicium respectively with gold were about equal 121 Further studies showed that flerovium was more reactive than copernicium in contradiction to previous experiments and predictions 67 In a 2014 paper detailing the experimental results of the chemical characterization of flerovium the GSI group wrote flerovium is the least reactive element in the group but still a metal 122 Nevertheless in a 2016 conference about chemistry and physics of heavy and superheavy elements Alexander Yakushev and Robert Eichler two scientists who had been active at GSI and FLNR in determining flerovium s chemistry still urged caution based on the inconsistencies of the various experiments previously listed noting that the question of whether flerovium was a metal or a noble gas was still open with the known evidence one study suggested a weak noble gas like interaction between flerovium and gold while the other suggested a stronger metallic interaction 123 The longer lived isotope 289Fl has been considered of interest for future radiochemical studies 124 New experiments published in 2022 suggest that flerovium is a metal exhibiting lower reactivity towards gold than mercury but higher reactivity than radon The experiments could not identify if the adsorption was due to elemental flerovium considered more likely or if it was due to a flerovium compound such as FlO that was more reactive towards gold than elemental flerovium but both scenarios involve flerovium forming chemical bonds 125 126 See also editIsland of stability Flerovium Unbinilium Unbihexium Isotopes of flerovium Extended periodic tablePortal nbsp ChemistryFlerovium at Wikipedia s sister projects nbsp Definitions from Wiktionary nbsp Media from CommonsNotes edit In nuclear physics an element is called heavy if its atomic number is high lead element 82 is one example of such a heavy element The term superheavy elements typically refers to elements with atomic number greater than 103 although there are other definitions such as atomic number greater than 100 19 or 112 20 sometimes the term is presented an equivalent to the term transactinide which puts an upper limit before the beginning of the hypothetical superactinide series 21 Terms heavy isotopes of a given element and heavy nuclei mean what could be understood in the common language isotopes of high mass for the given element and nuclei of high mass respectively In 2009 a team at the JINR led by Oganessian published results of their attempt to create hassium in a symmetric 136Xe 136Xe reaction They failed to observe a single atom in such a reaction putting the upper limit on the cross section the measure of probability of a nuclear reaction as 2 5 pb 22 In comparison the reaction that resulted in hassium discovery 208Pb 58Fe had a cross section of 20 pb more specifically 19 19 11 pb as estimated by the discoverers 23 The amount of energy applied to the beam particle to accelerate it can also influence the value of cross section For example in the 2814 Si 10 n 2813 Al 11 p reaction cross section changes smoothly from 370 mb at 12 3 MeV to 160 mb at 18 3 MeV with a broad peak at 13 5 MeV with the maximum value of 380 mb 27 This figure also marks the generally accepted upper limit for lifetime of a compound nucleus 32 This separation is based on that the resulting nuclei move past the target more slowly then the unreacted beam nuclei The separator contains electric and magnetic fields whose effects on a moving particle cancel out for a specific velocity of a particle 34 Such separation can also be aided by a time of flight measurement and a recoil energy measurement a combination of the two may allow to estimate the mass of a nucleus 35 Not all decay modes are caused by electrostatic repulsion For example beta decay is caused by the weak interaction 42 It was already known by the 1960s that ground states of nuclei differed in energy and shape as well as that certain magic numbers of nucleons corresponded to greater stability of a nucleus However it was assumed that there was no nuclear structure in superheavy nuclei as they were too deformed to form one 47 Since mass of a nucleus is not measured directly but is rather calculated from that of another nucleus such measurement is called indirect Direct measurements are also possible but for the most part they have remained unavailable for superheavy nuclei 52 The first direct measurement of mass of a superheavy nucleus was reported in 2018 at LBNL 53 Mass was determined from the location of a nucleus after the transfer the location helps determine its trajectory which is linked to the mass to charge ratio of the nucleus since the transfer was done in presence of a magnet 54 If the decay occurred in a vacuum then since total momentum of an isolated system before and after the decay must be preserved the daughter nucleus would also receive a small velocity The ratio of the two velocities and accordingly the ratio of the kinetic energies would thus be inverse to the ratio of the two masses The decay energy equals the sum of the known kinetic energy of the alpha particle and that of the daughter nucleus an exact fraction of the former 43 The calculations hold for an experiment as well but the difference is that the nucleus does not move after the decay because it is tied to the detector Spontaneous fission was discovered by Soviet physicist Georgy Flerov 55 a leading scientist at JINR and thus it was a hobbyhorse for the facility 56 In contrast the LBL scientists believed fission information was not sufficient for a claim of synthesis of an element They believed spontaneous fission had not been studied enough to use it for identification of a new element since there was a difficulty of establishing that a compound nucleus had only ejected neutrons and not charged particles like protons or alpha particles 32 They thus preferred to link new isotopes to the already known ones by successive alpha decays 55 For instance element 102 was mistakenly identified in 1957 at the Nobel Institute of Physics in Stockholm Stockholm County Sweden 57 There were no earlier definitive claims of creation of this element and the element was assigned a name by its Swedish American and British discoverers nobelium It was later shown that the identification was incorrect 58 The following year RL was unable to reproduce the Swedish results and announced instead their synthesis of the element that claim was also disproved later 58 JINR insisted that they were the first to create the element and suggested a name of their own for the new element joliotium 59 the Soviet name was also not accepted JINR later referred to the naming of the element 102 as hasty 60 This name was proposed to IUPAC in a written response to their ruling on priority of discovery claims of elements signed 29 September 1992 60 The name nobelium remained unchanged on account of its widespread usage 61 Different sources give different values for half lives the most recently published values are listed a b This isotope is unconfirmed Specifically 291Mc 291Fl 291Nh 287Nh 287Cn 287Rg 283Rg and 283Ds which are expected to decay to the relatively longer lived nuclei 283Mt 287Ds and 291Cn 84 It is estimated that it requires around 10 14 s for the nucleons to arrange themselves into nuclear shells at which point the compound nucleus becomes a nuclide and this number is used by IUPAC as the minimum half life a claimed isotope must have to be recognized as a nuclide 97 The quantum number corresponds to the letter in the electron orbital name 0 to s 1 to p 2 to d etc See azimuthal quantum number for more information References edit Flerovium and Livermorium The Periodic Table of Videos University of Nottingham 2 December 2011 Retrieved 4 June 2012 flerovium Lexico UK English Dictionary UK English Dictionary UK English Dictionary Oxford University Press Archived from the original on 5 February 2021 a b c d e f g h i j k l m n o p q r s t Hoffman Darleane C Lee Diana M Pershina Valeria 2006 Transactinides and the future elements In Morss Edelstein Norman M Fuger Jean eds The Chemistry of the Actinide and Transactinide Elements 3rd ed Dordrecht The Netherlands Springer Science Business Media ISBN 978 1 4020 3555 5 a b c d Florez Edison Smits Odile R Mewes Jan Michael Jerabek Paul Schwerdtfeger Peter 2022 From the gas phase to the solid state The chemical bonding in the superheavy element flerovium The Journal of Chemical Physics 157 doi 10 1063 5 0097642 a b c d e Fricke Burkhard 1975 Superheavy elements a prediction of their chemical and physical properties Recent Impact of Physics on Inorganic Chemistry Structure and Bonding 21 89 144 doi 10 1007 BFb0116498 ISBN 978 3 540 07109 9 Retrieved 4 October 2013 a b c d e f Schwerdtfeger Peter Seth Michael 2002 Relativistic Quantum Chemistry of the Superheavy Elements Closed Shell Element 114 as a Case Study PDF Journal of Nuclear and Radiochemical Sciences 3 1 133 136 doi 10 14494 jnrs2000 3 133 Retrieved 12 September 2014 Pershina Valeria 30 November 2013 Theoretical Chemistry of the Heaviest Elements In Schadel Matthias Shaughnessy Dawn eds The Chemistry of Superheavy Elements 2nd ed Springer Science amp Business Media p 154 ISBN 9783642374661 Bonchev Danail Kamenska Verginia 1981 Predicting the Properties of the 113 120 Transactinide Elements Journal of Physical Chemistry American Chemical Society 85 9 1177 1186 doi 10 1021 j150609a021 a b Element 114 is Named Flerovium and Element 116 is Named Livermorium Press release IUPAC 30 May 2012 Archived from the original on 2 June 2012 Utyonkov V K et al 2015 Synthesis of superheavy nuclei at limits of stability 239 240Pu 48Ca and 249 251Cf 48Ca reactions PDF Super Heavy Nuclei International Symposium Texas A amp M University College Station TX USA March 31 April 02 2015 a b c Utyonkov V K Brewer N T Oganessian Yu Ts Rykaczewski K P et al 15 September 2015 Experiments on the synthesis of superheavy nuclei 284Fl and 285Fl in the 239 240Pu 48Ca reactions Physical Review C 92 3 034609 Bibcode 2015PhRvC 92c4609U doi 10 1103 PhysRevC 92 034609 a b c Utyonkov V K Brewer N T Oganessian Yu Ts Rykaczewski K P et al 30 January 2018 Neutron deficient superheavy nuclei obtained in the 240Pu 48Ca reaction Physical Review C 97 14320 1 10 Bibcode 2018PhRvC 97a4320U doi 10 1103 PhysRevC 97 014320 a b c d Oganessian Yu Ts Utyonkov V K Ibadullayev D et al 2022 Investigation of 48Ca induced reactions with 242Pu and 238U targets at the JINR Superheavy Element Factory Physical Review C 106 024612 doi 10 1103 PhysRevC 106 024612 Hofmann S Heinz S Mann R Maurer J et al 2016 Remarks on the Fission Barriers of SHN and Search for Element 120 In Peninozhkevich Yu E Sobolev Yu G eds Exotic Nuclei EXON 2016 Proceedings of the International Symposium on Exotic Nuclei Exotic Nuclei pp 155 164 ISBN 9789813226555 a b c d e Hofmann S Heinz S Mann R Maurer J et al 2016 Review of even element super heavy nuclei and search for element 120 The European Physics Journal A 2016 52 Bibcode 2016EPJA 52 180H doi 10 1140 epja i2016 16180 4 a b c Kaji Daiya Morita Kosuke Morimoto Kouji Haba Hiromitsu et al 2017 Study of the Reaction 48Ca 248Cm 296Lv at RIKEN GARIS Journal of the Physical Society of Japan 86 034201 1 7 Bibcode 2017JPSJ 86c4201K doi 10 7566 JPSJ 86 034201 Eichler Robert et al 2010 Indication for a volatile element 114 PDF Radiochimica Acta 98 3 133 139 doi 10 1524 ract 2010 1705 S2CID 95172228 a b Gaggeler H W 5 7 November 2007 Gas Phase Chemistry of Superheavy Elements PDF Paul Scherrer Institute Archived from the original PDF on 20 February 2012 Retrieved 10 August 2013 Kramer K 2016 Explainer superheavy elements Chemistry World Retrieved 15 March 2020 Discovery of Elements 113 and 115 Lawrence Livermore National Laboratory Archived from the original on 11 September 2015 Retrieved 15 March 2020 Eliav E Kaldor U Borschevsky A 2018 Electronic Structure of the Transactinide Atoms In Scott R A ed Encyclopedia of Inorganic and Bioinorganic Chemistry John Wiley amp Sons pp 1 16 doi 10 1002 9781119951438 eibc2632 ISBN 978 1 119 95143 8 S2CID 127060181 Oganessian Yu Ts Dmitriev S N Yeremin A V et al 2009 Attempt to produce the isotopes of element 108 in the fusion reaction 136Xe 136Xe Physical Review C 79 2 024608 doi 10 1103 PhysRevC 79 024608 ISSN 0556 2813 Munzenberg G Armbruster P Folger H et al 1984 The identification of element 108 PDF Zeitschrift fur Physik A 317 2 235 236 Bibcode 1984ZPhyA 317 235M doi 10 1007 BF01421260 S2CID 123288075 Archived from the original PDF on 7 June 2015 Retrieved 20 October 2012 Subramanian S 28 August 2019 Making New Elements Doesn t Pay Just Ask This Berkeley Scientist Bloomberg Businessweek Retrieved 18 January 2020 a b c d e f Ivanov D 2019 Sverhtyazhelye shagi v neizvestnoe Superheavy steps into the unknown nplus1 ru in Russian Retrieved 2 February 2020 Hinde D 2017 Something new and superheavy at the periodic table The Conversation Retrieved 30 January 2020 Kern B D Thompson W E Ferguson J M 1959 Cross sections for some n p and n a reactions Nuclear Physics 10 226 234 Bibcode 1959NucPh 10 226K doi 10 1016 0029 5582 59 90211 1 Wakhle A Simenel C Hinde D J et al 2015 Simenel C Gomes P R S Hinde D J et al eds Comparing Experimental and Theoretical Quasifission Mass Angle Distributions European Physical Journal Web of Conferences 86 00061 Bibcode 2015EPJWC 8600061W doi 10 1051 epjconf 20158600061 hdl 1885 148847 ISSN 2100 014X Nuclear Reactions PDF pp 7 8 Retrieved 27 January 2020 Published as Loveland W D Morrissey D J Seaborg G T 2005 Nuclear Reactions Modern Nuclear Chemistry John Wiley amp Sons Inc pp 249 297 doi 10 1002 0471768626 ch10 ISBN 978 0 471 76862 3 a b Krasa A 2010 Neutron Sources for ADS Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague 4 8 S2CID 28796927 Wapstra A H 1991 Criteria that must be satisfied for the discovery of a new chemical element to be recognized PDF Pure and Applied Chemistry 63 6 883 doi 10 1351 pac199163060879 ISSN 1365 3075 S2CID 95737691 a b Hyde E K Hoffman D C Keller O L 1987 A History and Analysis of the Discovery of Elements 104 and 105 Radiochimica Acta 42 2 67 68 doi 10 1524 ract 1987 42 2 57 ISSN 2193 3405 S2CID 99193729 a b c d Chemistry World 2016 How to Make Superheavy Elements and Finish the Periodic Table Video Scientific American Retrieved 27 January 2020 Hoffman Ghiorso amp Seaborg 2000 p 334 Hoffman Ghiorso amp Seaborg 2000 p 335 Zagrebaev Karpov amp Greiner 2013 p 3 Beiser 2003 p 432 a b Pauli N 2019 Alpha decay PDF Introductory Nuclear Atomic and Molecular Physics Nuclear Physics Part Universite libre de Bruxelles Retrieved 16 February 2020 a b c d e Pauli N 2019 Nuclear fission PDF Introductory Nuclear Atomic and Molecular Physics Nuclear Physics Part Universite libre de Bruxelles Retrieved 16 February 2020 Staszczak A Baran A Nazarewicz W 2013 Spontaneous fission modes and lifetimes of superheavy elements in the nuclear density functional theory Physical Review C 87 2 024320 1 arXiv 1208 1215 Bibcode 2013PhRvC 87b4320S doi 10 1103 physrevc 87 024320 ISSN 0556 2813 Audi et al 2017 pp 030001 129 030001 138 Beiser 2003 p 439 a b Beiser 2003 p 433 Audi et al 2017 p 030001 125 Aksenov N V Steinegger P Abdullin F Sh et al 2017 On the volatility of nihonium Nh Z 113 The European Physical Journal A 53 7 158 Bibcode 2017EPJA 53 158A doi 10 1140 epja i2017 12348 8 ISSN 1434 6001 S2CID 125849923 Beiser 2003 p 432 433 a b c Oganessian Yu 2012 Nuclei in the Island of Stability of Superheavy Elements Journal of Physics Conference Series 337 1 012005 1 012005 6 Bibcode 2012JPhCS 337a2005O doi 10 1088 1742 6596 337 1 012005 ISSN 1742 6596 Moller P Nix J R 1994 Fission properties of the heaviest elements PDF Dai 2 Kai Hadoron Tataikei no Simulation Symposium Tokai mura Ibaraki Japan University of North Texas Retrieved 16 February 2020 a b Oganessian Yu Ts 2004 Superheavy elements Physics World 17 7 25 29 doi 10 1088 2058 7058 17 7 31 Retrieved 16 February 2020 Schadel M 2015 Chemistry of the superheavy elements Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences 373 2037 20140191 Bibcode 2015RSPTA 37340191S doi 10 1098 rsta 2014 0191 ISSN 1364 503X PMID 25666065 Hulet E K 1989 Biomodal spontaneous fission 50th Anniversary of Nuclear Fission Leningrad USSR Bibcode 1989nufi rept 16H Oganessian Yu Ts Rykaczewski K P 2015 A beachhead on the island of stability Physics Today 68 8 32 38 Bibcode 2015PhT 68h 32O doi 10 1063 PT 3 2880 ISSN 0031 9228 OSTI 1337838 S2CID 119531411 Grant A 2018 Weighing the heaviest elements Physics Today doi 10 1063 PT 6 1 20181113a S2CID 239775403 Howes L 2019 Exploring the superheavy elements at the end of the periodic table Chemical amp Engineering News Retrieved 27 January 2020 a b Robinson A E 2019 The Transfermium Wars Scientific Brawling and Name Calling during the Cold War Distillations Retrieved 22 February 2020 Populyarnaya biblioteka himicheskih elementov Siborgij ekavolfram Popular library of chemical elements Seaborgium eka tungsten n t ru in Russian Retrieved 7 January 2020 Reprinted from Ekavolfram Eka tungsten Populyarnaya biblioteka himicheskih elementov Serebro Nilsborij i dalee Popular library of chemical elements Silver through nielsbohrium and beyond in Russian Nauka 1977 Nobelium Element information properties and uses Periodic Table Royal Society of Chemistry Retrieved 1 March 2020 a b Kragh 2018 pp 38 39 Kragh 2018 p 40 a b Ghiorso A Seaborg G T Oganessian Yu Ts et al 1993 Responses on the report Discovery of the Transfermium elements followed by reply to the responses by Transfermium Working Group PDF Pure and Applied Chemistry 65 8 1815 1824 doi 10 1351 pac199365081815 S2CID 95069384 Archived PDF from the original on 25 November 2013 Retrieved 7 September 2016 Commission on Nomenclature of Inorganic Chemistry 1997 Names and symbols of transfermium elements IUPAC Recommendations 1997 PDF Pure and Applied Chemistry 69 12 2471 2474 doi 10 1351 pac199769122471 a b c d e Sacks O 8 February 2004 Greetings From the Island of Stability The New York Times Bemis C E Nix J R 1977 Superheavy elements the quest in perspective PDF Comments on Nuclear and Particle Physics 7 3 65 78 ISSN 0010 2709 Emsley John 2011 Nature s Building Blocks An A Z Guide to the Elements New ed New York NY Oxford University Press p 580 ISBN 978 0 19 960563 7 Hoffman D C Ghiorso A Seaborg G T 2000 The Transuranium People The Inside Story Imperial College Press Bibcode 2000tpis book H ISBN 978 1 86094 087 3 Epherre M Stephan C 1975 Les elements superlourds PDF Le Journal de Physique Colloques in French 11 36 C5 159 164 doi 10 1051 jphyscol 1975541 a b c d e f g h Kratz J V 5 September 2011 The Impact of Superheavy Elements on the Chemical and Physical Sciences PDF 4th International Conference on the Chemistry and Physics of the Transactinide Elements Retrieved 27 August 2013 Chapman Kit 30 November 2016 What it takes to make a new element Chemistry World Royal Society of Chemistry Retrieved 3 December 2016 a b Oganessian Yu Ts et al 1999 Synthesis of Superheavy Nuclei in the 48Ca 244Pu Reaction PDF Physical Review Letters 83 16 3154 Bibcode 1999PhRvL 83 3154O doi 10 1103 PhysRevLett 83 3154 Archived from the original PDF on 30 July 2020 Retrieved 28 August 2013 a b Oganessian Yu Ts et al 2000 Synthesis of superheavy nuclei in the 48Ca 244Pu reaction 288114 PDF Physical Review C 62 4 041604 Bibcode 2000PhRvC 62d1604O doi 10 1103 PhysRevC 62 041604 Oganessian Yu Ts et al 2004 Measurements of cross sections and decay properties of the isotopes of elements 112 114 and 116 produced in the fusion reactions 233 238U 242Pu and 248Cm 48Ca PDF Physical Review C 70 6 064609 Bibcode 2004PhRvC 70f4609O doi 10 1103 PhysRevC 70 064609 Archived from the original PDF on 28 May 2008 a b c Browne M W 27 February 1999 Glenn Seaborg Leader of Team That Found Plutonium Dies at 86 The New York Times Archived from the original on 22 May 2013 Retrieved 26 August 2013 Oganessian Yu Ts et al 1999 Synthesis of nuclei of the superheavy element 114 in reactions induced by 48Ca Nature 400 6741 242 Bibcode 1999Natur 400 242O doi 10 1038 22281 S2CID 4399615 a b Oganessian Yu Ts et al 2004 Measurements of cross sections for the fusion evaporation reactions 244Pu 48Ca xn 292 x114 and 245Cm 48Ca xn 293 x116 Physical Review C 69 5 054607 Bibcode 2004PhRvC 69e4607O doi 10 1103 PhysRevC 69 054607 Hofmann S Heinz S Mann R Maurer J Munzenberg G Antalic S Barth W Burkhard H G Dahl L Eberhardt K Grzywacz R Hamilton J H Henderson R A Kenneally J M Kindler B Kojouharov I Lang R Lommel B Miernik K Miller D Moody K J Morita K Nishio K Popeko A G Roberto J B Runke J Rykaczewski K P Saro S Schneidenberger C Schott H J Shaughnessy D A Stoyer M A Thorle Pospiech P Tinschert K Trautmann N Uusitalo J Yeremin A V 2016 Remarks on the Fission Barriers of SHN and Search for Element 120 In Peninozhkevich Yu E Sobolev Yu G eds Exotic Nuclei EXON 2016 Proceedings of the International Symposium on Exotic Nuclei Exotic Nuclei pp 155 164 ISBN 9789813226555 Barber R C Gaggeler H W Karol P J Nakahara H Vardaci E Vogt E 2009 Discovery of the element with atomic number 112 IUPAC Technical Report PDF Pure and Applied Chemistry 81 7 1331 doi 10 1351 PAC REP 08 03 05 S2CID 95703833 Barber R C Karol P J Nakahara H Vardaci E Vogt E W 2011 Discovery of the elements with atomic numbers greater than or equal to 113 IUPAC Technical Report Pure and Applied Chemistry 83 7 1485 doi 10 1351 PAC REP 10 05 01 a b Oganessian Y T 2015 Super heavy element research Reports on Progress in Physics 78 3 036301 Bibcode 2015RPPh 78c6301O doi 10 1088 0034 4885 78 3 036301 PMID 25746203 S2CID 37779526 Audi G Kondev F G Wang M Huang W J Naimi S 2017 The NUBASE2016 evaluation of nuclear properties PDF Chinese Physics C 41 3 030001 Bibcode 2017ChPhC 41c0001A doi 10 1088 1674 1137 41 3 030001 Forsberg U Rudolph D Fahlander C Golubev P Sarmiento L G Aberg S Block M Dullmann Ch E Hessberger F P Kratz J V Yakushev Alexander 9 July 2016 A new assessment of the alleged link between element 115 and element 117 decay chains PDF Physics Letters B 760 2016 293 6 Bibcode 2016PhLB 760 293F doi 10 1016 j physletb 2016 07 008 Retrieved 2 April 2016 Forsberg Ulrika Fahlander Claes Rudolph Dirk 2016 Congruence of decay chains of elements 113 115 and 117 PDF Nobel Symposium NS160 Chemistry and Physics of Heavy and Superheavy Elements doi 10 1051 epjconf 201613102003 Morita Kōsuke 2014 Research on Superheavy Elements at RIKEN PDF APS Division of Nuclear Physics Meeting Abstracts 2014 DG 002 Bibcode 2014APS DNP DG002M Retrieved 28 April 2017 Morimoto Kouji October 2009 Production and Decay Properties of 266Bh and its daughter nuclei by using the 248Cm 23Na 5n 266Bh Reaction PDF www kernchemie uni mainz de University of Mainz Archived from the original PDF on 21 September 2017 Retrieved 28 April 2017 a b c d e f g h i Zagrebaev Valeriy Karpov Alexander Greiner Walter 2013 Future of superheavy element research Which nuclei could be synthesized within the next few years PDF Journal of Physics Conference Series Vol 420 IOP Science pp 1 15 Retrieved 20 August 2013 Heinz Sophie 1 April 2015 Probing the Stability of Superheavy Nuclei with Radioactive Ion Beams PDF cyclotron tamu edu Texas A amp M University Retrieved 30 April 2017 Chatt J 1979 Recommendations for the naming of elements of atomic numbers greater than 100 Pure and Applied Chemistry 51 2 381 384 doi 10 1351 pac197951020381 Koppenol W H 2002 Naming of new elements IUPAC Recommendations 2002 PDF Pure and Applied Chemistry 74 5 787 doi 10 1351 pac200274050787 S2CID 95859397 Brown M 6 June 2011 Two Ultraheavy Elements Added to Periodic Table Wired Retrieved 7 June 2011 a b Welsh J 2 December 2011 Two Elements Named Livermorium and Flerovium LiveScience Retrieved 2 December 2011 Rossijskie fiziki predlozhat nazvat 116 himicheskij element moskoviem Russian physicists have offered to call 116 chemical element moscovium RIA Novosti 26 March 2011 Retrieved 8 May 2011 Mikhail Itkis the vice director of JINR stated We would like to name element 114 after Georgy Flerov flerovium and the second element 116 moscovium not after Moscow but after Moscow Oblast Popeko Andrey G 2016 Synthesis of superheavy elements PDF jinr ru Joint Institute for Nuclear Research Archived from the original PDF on 4 February 2018 Retrieved 4 February 2018 Oganessian Yu Ts 10 October 2015 Gamburgskij schet Hamburg reckoning Interview in Russian Interviewed by Orlova O Public Television of Russia Archived from the original on 17 November 2021 Retrieved 18 January 2020 Subramanian S Making New Elements Doesn t Pay Just Ask This Berkeley Scientist Bloomberg Businessweek Retrieved 18 January 2020 a b c d e f g h i j k l m Fricke B Greiner W Waber J T 1971 The continuation of the periodic table up to Z 172 The chemistry of superheavy elements PDF Theoretica Chimica Acta 21 3 235 260 doi 10 1007 BF01172015 S2CID 117157377 Kalinkin B N Gareev F A 2001 Synthesis of Superheavy elements and Theory of Atomic Nucleus p 118 arXiv nucl th 0111083v2 Bibcode 2002exnu conf 118K CiteSeerX 10 1 1 264 7426 doi 10 1142 9789812777300 0009 ISBN 978 981 238 025 8 S2CID 119481840 a href Template Cite book html title Template Cite book cite book a journal ignored help a b JINR Annual Reports 2000 2006 JINR Retrieved 27 August 2013 a b Emsley John 2011 Nature s Building Blocks An A Z Guide to the Elements New ed New York NY Oxford University Press p 590 ISBN 978 0 19 960563 7 a b c Zagrebaev V Greiner W 2008 Synthesis of superheavy nuclei A search for new production reactions Physical Review C 78 3 034610 arXiv 0807 2537 Bibcode 2008PhRvC 78c4610Z doi 10 1103 PhysRevC 78 034610 Chowdhury P R Samanta C Basu D N 2006 a decay half lives of new superheavy elements Physical Review C 73 1 014612 arXiv nucl th 0507054 Bibcode 2006PhRvC 73a4612C doi 10 1103 PhysRevC 73 014612 S2CID 118739116 Samanta C Chowdhury P R Basu D N 2007 Predictions of alpha decay half lives of heavy and superheavy elements Nuclear Physics A 789 1 4 142 154 arXiv nucl th 0703086 Bibcode 2007NuPhA 789 142S CiteSeerX 10 1 1 264 8177 doi 10 1016 j nuclphysa 2007 04 001 S2CID 7496348 Chowdhury P R Samanta C Basu D N 2008 Search for long lived heaviest nuclei beyond the valley of stability Physical Review C 77 4 044603 arXiv 0802 3837 Bibcode 2008PhRvC 77d4603C doi 10 1103 PhysRevC 77 044603 S2CID 119207807 Roy Chowdhury P Samanta C Basu D N 2008 Nuclear half lives for a radioactivity of elements with 100 Z 130 Atomic Data and Nuclear Data Tables 94 6 781 806 arXiv 0802 4161 Bibcode 2008ADNDT 94 781C doi 10 1016 j adt 2008 01 003 S2CID 96718440 Thayer 2010 pp 63 64 Faegri K Saue T 2001 Diatomic molecules between very heavy elements of group 13 and group 17 A study of relativistic effects on bonding Journal of Chemical Physics 115 6 2456 Bibcode 2001JChPh 115 2456F doi 10 1063 1 1385366 Thayer 2010 pp 63 67 Gong Sheng Wu Wei Wang Fancy Qian Liu Jie Zhao Yu Shen Yiheng Wang Shuo Sun Qiang Wang Qian 8 February 2019 Classifying superheavy elements by machine learning Physical Review A 99 2 022110 1 7 Bibcode 2019PhRvA 99b2110G doi 10 1103 PhysRevA 99 022110 hdl 1721 1 120709 S2CID 126792685 Mewes Jan Michael Schwerdtfeger Peter 11 February 2021 Exclusively Relativistic Periodic Trends in the Melting and Boiling Points of Group 12 Angewandte Chemie 60 14 7703 7709 doi 10 1002 anie 202100486 PMC 8048430 PMID 33576164 Borschevsky Anastasia Pershina Valeria Kaldor Uzi Eliav Ephraim Fully relativistic ab initio studies of superheavy elements PDF www kernchemie uni mainz de Johannes Gutenberg University Mainz Archived from the original PDF on 15 January 2018 Retrieved 15 January 2018 Hermann Andreas Furthmuller Jurgen Gaggeler Heinz W Schwerdtfeger Peter 2010 Spin orbit effects in structural and electronic properties for the solid state of the group 14 elements from carbon to superheavy element 114 Physical Review B 82 15 155116 1 8 Bibcode 2010PhRvB 82o5116H doi 10 1103 PhysRevB 82 155116 Maiz Hadj Ahmed H Zaoui A Ferhat M 2017 Revisiting the ground state phase stability of super heavy element Flerovium Cogent Physics 4 1 Bibcode 2017CogPh 4m8045M doi 10 1080 23311940 2017 1380454 S2CID 125920084 a b Thayer 2010 pp 64 Zaitsevskii A van Wullen C Rusakov A Titov A September 2007 Relativistic DFT and ab initio calculations on the seventh row superheavy elements E113 E114 PDF jinr ru Retrieved 17 February 2018 a b Pershina 2010 p 502 Pershina 2010 p 503 a b Thayer 2010 p 83 Balasubramanian K 30 July 2002 Breakdown of the singlet and triplet nature of electronic states of the superheavy element 114 dihydride 114H2 Journal of Chemical Physics 117 16 7426 32 Bibcode 2002JChPh 117 7426B doi 10 1063 1 1508371 Winter M 2012 Flerovium The Essentials WebElements University of Sheffield Retrieved 28 August 2008 a b c d Flerov Laboratory of Nuclear Reactions PDF 2009 pp 86 96 Retrieved 1 June 2012 a b c d Eichler Robert Aksenov N V Albin Yu V Belozerov A V Bozhikov G A Chepigin V I Dmitriev S N Dressler R Gaggeler H W Gorshkov V A Henderson G S 2010 Indication for a volatile element 114 PDF Radiochimica Acta 98 3 133 139 doi 10 1524 ract 2010 1705 S2CID 95172228 Kratz Jens Volker 2012 The impact of the properties of the heaviest elements on the chemical and physical sciences Radiochimica Acta 100 8 9 569 578 doi 10 1524 ract 2012 1963 S2CID 97915854 Dullmann Christoph E 18 September 2012 Superheavy element 114 is a volatile metal Archived from the original on 27 September 2013 Retrieved 25 September 2013 Yakushev Alexander Gates Jacklyn M Turler Andreas Schadel Matthias Dullmann Christoph E Ackermann Dieter Andersson Lise Lotte Block Michael Bruchle Willy Dvorak Jan Eberhardt Klaus Essel Hans G Even Julia Forsberg Ulrika Gorshkov Alexander Graeger Reimar Gregorich Kenneth E Hartmann Willi Herzberg Rolf Deitmar Hessberger Fritz P Hild Daniel Hubner Annett Jager Egon Khuyagbaatar Jadambaa Kindler Birgit Kratz Jens V Krier Jorg Kurz Nikolaus Lommel Bettina Niewisch Lorenz J Nitsche Heino Omtvedt Jon Petter Parr Edward Qin Zhi Rudolph Dirk Runke Jorg Schausten Birgitta Schimpf Erwin Semchenkov Andrey Steiner Jutta Thorle Pospiech Petra Uusitalo Juha Wegrzecki Maciej Wiehl Norbert 2014 Superheavy Element Flerovium Element 114 Is a Volatile Metal PDF Inorg Chem 53 1624 1624 1629 doi 10 1021 ic4026766 PMID 24456007 S2CID 5140723 Retrieved 30 March 2017 Yakushev Alexander Eichler Robert 2016 Gas phase chemistry of element 114 flerovium PDF Nobel Symposium NS160 Chemistry and Physics of Heavy and Superheavy Elements doi 10 1051 epjconf 201613107003 Moody Ken 30 November 2013 Synthesis of Superheavy Elements In Schadel Matthias Shaughnessy Dawn eds The Chemistry of Superheavy Elements 2nd ed Springer Science amp Business Media pp 24 8 ISBN 9783642374661 Ingo Peter 15 September 2022 Study shows flerovium is the most volatile metal in the periodic table phys org Retrieved 22 November 2022 Yakushev A Lens L Dullmann Ch E et al 25 August 2022 On the adsorption and reactivity of element 114 flerovium Frontiers in Chemistry 10 976635 976635 Bibcode 2022FrCh 10 6635Y doi 10 3389 fchem 2022 976635 PMC 9453156 PMID 36092655 Bibliography editAudi G Kondev F G Wang M et al 2017 The NUBASE2016 evaluation of nuclear properties Chinese Physics C 41 3 030001 Bibcode 2017ChPhC 41c0001A doi 10 1088 1674 1137 41 3 030001 pp 030001 1 030001 17 pp 030001 18 030001 138 Table I The NUBASE2016 table of nuclear and decay properties Beiser A 2003 Concepts of modern physics 6th ed McGraw Hill ISBN 978 0 07 244848 1 OCLC 48965418 Hoffman D C Ghiorso A Seaborg G T 2000 The Transuranium People The Inside Story World Scientific ISBN 978 1 78 326244 1 Kragh H 2018 From Transuranic to Superheavy Elements A Story of Dispute and Creation Springer ISBN 978 3 319 75813 8 Zagrebaev V Karpov A Greiner W 2013 Future of superheavy element research Which nuclei could be synthesized within the next few years Journal of Physics Conference Series 420 1 012001 arXiv 1207 5700 Bibcode 2013JPhCS 420a2001Z doi 10 1088 1742 6596 420 1 012001 ISSN 1742 6588 S2CID 55434734 Barysz M Ishikawa Y eds 2010 Relativisic Methods for Chemists Springer ISBN 978 1 4020 9974 8 Thayer J S 2010 Relativistic Effects and the Chemistry of the Heavier Main Group Elements Relativistic Methods for Chemists Challenges and Advances in Computational Chemistry and Physics Vol 10 pp 63 97 doi 10 1007 978 1 4020 9975 5 2 ISBN 978 1 4020 9974 8 Styszinski J 2010 Why do we need relativistic computational methods p 99 Pershina V 2010 Electronic structure and chemistry of the heaviest elements p 450 External links edit nbsp Wikimedia Commons has media related to Flerovium CERN Courier First postcard from the island of nuclear stability CERN Courier Second postcard from the island of stability Retrieved from https en wikipedia org w index php title Flerovium amp oldid 1204176508, wikipedia, wiki, book, books, library,

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