Naturally occurring lanthanum (57La) is composed of one stable (139La) and one radioactive (138La) isotope, with the stable isotope, 139La, being the most abundant (99.91% natural abundance). There are 38 radioisotopes that have been characterized, with the most stable being 138La, with a half-life of 1.02×1011 years; 137La, with a half-life of 60,000 years and 140La, with a half-life of 1.6781 days. The remaining radioactive isotopes have half-lives that are less than a day and the majority of these have half-lives that are less than 1 minute. This element also has 12 nuclear isomers, the longest-lived of which is 132mLa, with a half-life of 24.3 minutes.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^Bold half-life – nearly stable, half-life longer than age of universe.
^ abc# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
Isotope masses from:
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Isotopic compositions and standard atomic masses from:
de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.
"News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
Half-life, spin, and isomer data selected from the following sources.
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
isotopes, lanthanum, naturally, occurring, lanthanum, 57la, composed, stable, 139la, radioactive, 138la, isotope, with, stable, isotope, 139la, being, most, abundant, natural, abundance, there, radioisotopes, that, have, been, characterized, with, most, stable. Naturally occurring lanthanum 57La is composed of one stable 139La and one radioactive 138La isotope with the stable isotope 139La being the most abundant 99 91 natural abundance There are 38 radioisotopes that have been characterized with the most stable being 138La with a half life of 1 02 1011 years 137La with a half life of 60 000 years and 140La with a half life of 1 6781 days The remaining radioactive isotopes have half lives that are less than a day and the majority of these have half lives that are less than 1 minute This element also has 12 nuclear isomers the longest lived of which is 132mLa with a half life of 24 3 minutes Main isotopes of lanthanum 57La Iso tope Decayabun dance half life t1 2 mode pro duct137La syn 6 104 y e 137Ba138La 0 089 1 05 1011 y e 138Bab 138Ce139La 99 911 stableStandard atomic weight Ar La 138 90547 0 00007138 91 0 01 abridged 1 2 viewtalkeditStable Z N chart of La and Ba The isotopes of lanthanum range in atomic weight from 116 95 u 117La to 154 96 u 155La List of isotopes EditNuclide n 1 Z N Isotopic mass Da n 2 n 3 Half life n 4 n 5 Decaymode n 6 Daughterisotope n 7 n 8 Spin andparity n 9 n 5 Natural abundance mole fraction NoteExcitation energy n 5 Normal proportion Range of variation117La 57 60 116 95007 43 23 5 26 ms b 117Ba 3 2 3 2 p 116Ba117mLa 151 12 keV 10 5 ms 9 2 118La 57 61 117 94673 32 200 ms b 118Ba119La 57 62 118 94099 43 1 s b 119Ba 11 2 120La 57 63 119 93807 54 2 8 2 s b 120Bab p 119Cs121La 57 64 120 93301 54 5 3 2 s b 121Ba 11 2 b p 120Cs122La 57 65 121 93071 32 8 6 5 s b 122Bab p 121Cs123La 57 66 122 92624 21 17 3 s b 123Ba 11 2 124La 57 67 123 92457 6 29 21 17 s b 124Ba 7 8 124mLa 100 100 keV 21 4 s low 125La 57 68 124 920816 28 64 8 12 s b 125Ba 11 2 125mLa 107 0 10 keV 390 40 ms 3 2 126La 57 69 125 91951 10 54 2 s b 126Ba 5 126mLa 210 410 keV 20 20 s 0 1 2 127La 57 70 126 916375 28 5 1 1 min b 127Ba 11 2 127mLa 14 8 12 keV 3 7 4 min b 127Ba 3 2 IT 127La128La 57 71 127 91559 6 5 18 14 min b 128Ba 5 128mLa 100 100 keV lt 1 4 min IT 128La 1 2 129La 57 72 128 912693 22 11 6 2 min b 129Ba 3 2 129mLa 172 1 4 keV 560 50 ms IT 129La 11 2 130La 57 73 129 912369 28 8 7 1 min b 130Ba 3 131La 57 74 130 91007 3 59 2 min b 131Ba 3 2 131mLa 304 52 24 keV 170 10 ms 11 2 132La 57 75 131 91010 4 4 8 2 h b 132Ba 2 132mLa 188 18 11 keV 24 3 5 min IT 76 132La 6 b 24 132Ba133La 57 76 132 90822 3 3 912 8 h b 133Ba 5 2 134La 57 77 133 908514 21 6 45 16 min b 134Ba 1 135La 57 78 134 906977 11 19 5 2 h b 135Ba 5 2 136La 57 79 135 90764 6 9 87 3 min b 136Ba 1 136mLa 255 9 keV 114 3 ms IT 136La 8 137La 57 80 136 906494 14 6 2 104 y EC 137Ba 7 2 extinct138La n 10 57 81 137 907112 4 1 02 1 1011 y b 66 4 138Ba 5 9 0 1 10 4b 33 6 138Ce138mLa 72 57 3 keV 116 5 ns 3 139La n 11 57 82 138 9063533 26 Stable n 12 7 2 0 99910 1 140La n 11 57 83 139 9094776 26 1 6781 3 d b 140Ce 3 141La 57 84 140 910962 5 3 92 3 h b 141Ce 7 2 142La 57 85 141 914079 6 91 1 5 min b 142Ce 2 143La 57 86 142 916063 17 14 2 1 min b 143Ce 7 2 144La 57 87 143 91960 5 40 8 4 s b 144Ce 3 145La 57 88 144 92165 10 24 8 20 s b 145Ce 5 2 146La 57 89 145 92579 8 6 27 10 s b 99 99 146Ce 2 b n 007 145Ce146mLa 130 130 keV 10 0 1 s b 146Ce 6 147La 57 90 146 92824 5 4 015 8 s b 99 96 147Ce 5 2 b n 04 146Ce148La 57 91 147 93223 6 1 26 8 s b 99 85 148Ce 2 b n 15 147Ce149La 57 92 148 93473 34 1 05 3 s b 98 6 149Ce 5 2 b n 1 4 148Ce150La 57 93 149 93877 43 510 30 ms b 97 3 150Ce 3 b n 2 7 149Ce151La 57 94 150 94172 43 300 ms gt 300 ns b 151Ce 5 2 152La 57 95 151 94625 43 200 ms gt 300 ns b 152Ce153La 57 96 152 94962 64 150 ms gt 300 ns b 153Ce 5 2 154La 57 97 153 95450 64 100 ms b 154Ce155La 57 98 154 95835 86 60 ms b 155Ce 5 2 This table header amp footer view mLa Excited nuclear isomer Uncertainty 1s is given in concise form in parentheses after the corresponding last digits Atomic mass marked value and uncertainty derived not from purely experimental data but at least partly from trends from the Mass Surface TMS Bold half life nearly stable half life longer than age of universe a b c Values marked are not purely derived from experimental data but at least partly from trends of neighboring nuclides TNN Modes of decay EC Electron captureIT Isomeric transitionn Neutron emissionp Proton emission Bold italics symbol as daughter Daughter product is nearly stable Bold symbol as daughter Daughter product is stable spin value Indicates spin with weak assignment arguments Primordial radionuclide a b Fission product Theoretically capable of spontaneous fissionReferences Edit Standard Atomic Weights Lanthanum CIAAW 2005 Prohaska Thomas Irrgeher Johanna Benefield Jacqueline et al 2022 05 04 Standard atomic weights of the elements 2021 IUPAC Technical Report Pure and Applied Chemistry doi 10 1515 pac 2019 0603 ISSN 1365 3075 Isotope masses from Audi Georges Bersillon Olivier Blachot Jean Wapstra Aaldert Hendrik 2003 The NUBASE evaluation of nuclear and decay properties Nuclear Physics A 729 3 128 Bibcode 2003NuPhA 729 3A doi 10 1016 j nuclphysa 2003 11 001 Isotopic compositions and standard atomic masses from de Laeter John Robert Bohlke John Karl De Bievre Paul Hidaka Hiroshi Peiser H Steffen Rosman Kevin J R Taylor Philip D P 2003 Atomic weights of the elements Review 2000 IUPAC Technical Report Pure and Applied Chemistry 75 6 683 800 doi 10 1351 pac200375060683 Wieser Michael E 2006 Atomic weights of the elements 2005 IUPAC Technical Report Pure and Applied Chemistry 78 11 2051 2066 doi 10 1351 pac200678112051 News amp Notices Standard Atomic Weights Revised International Union of Pure and Applied Chemistry 19 October 2005 Half life spin and isomer data selected from the following sources Audi Georges Bersillon Olivier Blachot Jean Wapstra Aaldert Hendrik 2003 The NUBASE evaluation of nuclear and decay properties Nuclear Physics A 729 3 128 Bibcode 2003NuPhA 729 3A doi 10 1016 j nuclphysa 2003 11 001 National Nuclear Data Center NuDat 2 x database Brookhaven National Laboratory Holden Norman E 2004 11 Table of the Isotopes In Lide David R ed CRC Handbook of Chemistry and Physics 85th ed Boca Raton Florida CRC Press ISBN 978 0 8493 0485 9 Retrieved from https en wikipedia org w index php title Isotopes of lanthanum amp oldid 1069513142 Lanthanum 138, wikipedia, wiki, book, books, library,
