Naturally occurring erbium (68Er) is composed of 6 stable isotopes, with 166Er being the most abundant (33.503% natural abundance). 39 radioisotopes have been characterized with between 74 and 112 neutrons, or 142 to 180 nucleons, with the most stable being 169Er with a half-life of 9.4 days, 172Er with a half-life of 49.3 hours, 160Er with a half-life of 28.58 hours, 165Er with a half-life of 10.36 hours, and 171Er with a half-life of 7.516 hours. All of the remaining radioactive isotopes have half-lives that are less than 3.5 hours, and the majority of these have half-lives that are less than 4 minutes. This element also has numerous meta states, with the most stable being 167mEr (t1/2 2.269 seconds).
The isotopes of erbium range in atomic weight from 141.9723 u (142Er) to 176.9541 u (177Er). The primary decay mode before the most abundant stable isotope, 166Er, is electron capture, and the primary mode after is beta decay. The primary decay products before 166Er are holmium isotopes, and the primary products after are thulium isotopes. All isotopes of erbium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.
^( ) – 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).
^ 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:
Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.
Isotopic compositions and standard atomic masses from:
Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
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.
Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
isotopes, erbium, naturally, occurring, erbium, 68er, composed, stable, isotopes, with, 166er, being, most, abundant, natural, abundance, radioisotopes, have, been, characterized, with, between, neutrons, nucleons, with, most, stable, being, 169er, with, half,. Naturally occurring erbium 68Er is composed of 6 stable isotopes with 166Er being the most abundant 33 503 natural abundance 39 radioisotopes have been characterized with between 74 and 112 neutrons or 142 to 180 nucleons with the most stable being 169Er with a half life of 9 4 days 172Er with a half life of 49 3 hours 160Er with a half life of 28 58 hours 165Er with a half life of 10 36 hours and 171Er with a half life of 7 516 hours All of the remaining radioactive isotopes have half lives that are less than 3 5 hours and the majority of these have half lives that are less than 4 minutes This element also has numerous meta states with the most stable being 167mEr t1 2 2 269 seconds Main isotopes of erbium 68Er Iso tope Decayabun dance half life t1 2 mode pro duct160Er syn 28 58 h e 160Ho162Er 0 139 stable164Er 1 601 stable165Er syn 10 36 h e 165Ho166Er 33 503 stable167Er 22 869 stable168Er 26 978 stable169Er syn 9 4 d b 169Tm170Er 14 910 stable171Er syn 7 516 h b 171Tm172Er syn 49 3 h b 172TmStandard atomic weight Ar Er 167 259 0 003167 26 0 01 abridged 1 2 viewtalkeditThe isotopes of erbium range in atomic weight from 141 9723 u 142Er to 176 9541 u 177Er The primary decay mode before the most abundant stable isotope 166Er is electron capture and the primary mode after is beta decay The primary decay products before 166Er are holmium isotopes and the primary products after are thulium isotopes All isotopes of erbium are either radioactive or observationally stable meaning that they are predicted to be radioactive but no actual decay has been observed List of isotopes EditNuclide n 1 Z N Isotopic mass Da n 2 n 3 Half life n 4 Decaymode n 5 Daughterisotope n 6 Spin andparity n 7 n 4 Natural abundance mole fraction Excitation energy n 4 Normal proportion Range of variation142Er 68 74 141 97002 54 10 ms p 141Ho 0 143Er 68 75 142 96655 43 200 ms b 143Ho 9 2 b p 142Dy144Er 68 76 143 96070 21 400 ms gt 200 ns b 144Ho 0 145Er 68 77 144 95787 22 900 200 ms b 145Ho 1 2 b p rare 144Dy145mEr 205 4 keV 1 0 3 s b 145Ho 11 2 IT rare 145Erb p rare 144Dy146Er 68 78 145 952418 7 1 7 6 s b 146Ho 0 b p rare 145Dy147Er 68 79 146 94996 4 3 2 1 2 s b 147Ho 1 2 b p rare 146Dy147mEr 100 50 keV 1 6 2 s b 147Ho 11 2 b p rare 146Dy148Er 68 80 147 944735 11 4 6 2 s b 99 85 148Ho 0 b p 15 147Dy148mEr 2 9132 4 MeV 13 3 ms IT 148Er 10 149Er 68 81 148 94231 3 4 2 s b 92 8 149Ho 1 2 b p 7 2 148Dy149m1Er 741 8 2 keV 8 9 2 s b 96 5 149Ho 11 2 IT 3 5 149Erb p 18 148Dy149m2Er 2 6111 3 MeV 0 61 8 ms IT 149Er 19 2 149m3Er 3 302 7 MeV 4 8 1 ms IT 149Er 27 2 150Er 68 82 149 937916 18 18 5 7 s b 150Ho 0 150mEr 2 7965 5 MeV 2 55 10 ms IT 150Er 10 151Er 68 83 150 937449 18 23 5 20 s b 151Ho 7 2 151m1Er 2 5860 5 MeV 580 20 ms IT 95 3 151Er 27 2 b 4 7 151Ho151m2Er 10 2866 10 MeV 0 42 5 ms IT 151Er 65 2 61 2 152Er 68 84 151 935050 9 10 3 1 s a 90 148Dy 0 b 10 152Ho153Er 68 85 152 935086 10 37 1 2 s a 53 149Dy 7 2 b 47 153Ho153m1Er 2 7982 10 MeV 373 9 ns IT 153Er 27 2 153m2Er 5 2481 10 MeV 248 32 ns IT 153Er 41 2 154Er 68 86 153 932791 5 3 73 9 min b 99 53 154Ho 0 a 47 150Dy155Er 68 87 154 933216 7 5 3 3 min b 99 978 155Ho 7 2 a 022 151Dy156Er 68 88 155 931066 26 19 5 10 min b 156Ho 0 a 1 2 10 5 152Dy157Er 68 89 156 931923 28 18 65 10 min b 157Ho 3 2 157mEr 155 4 3 keV 76 6 ms IT 157Er 9 2 158Er 68 90 157 929893 27 2 29 6 h EC 158Ho 0 159Er 68 91 158 930691 4 36 1 min b 159Ho 3 2 159m1Er 182 602 24 keV 337 14 ns IT 159Er 9 2 159m2Er 429 05 3 keV 590 60 ns IT 159Er 11 2 160Er 68 92 159 929077 26 28 58 9 h EC 160Ho 0 161Er 68 93 160 930004 9 3 21 3 h b 161Ho 3 2 161mEr 396 44 4 keV 7 5 7 ms IT 161Er 11 2 162Er 68 94 161 9287873 8 Observationally Stable n 8 0 0 00139 5 162mEr 2 02601 13 MeV 88 16 ns IT 162Er 7 163Er 68 95 162 930040 5 75 0 4 min b 163Ho 5 2 163mEr 445 5 6 keV 580 100 ns IT 163Er 11 2 164Er 68 96 163 9292077 8 Observationally Stable n 9 0 0 01601 3 165Er 68 97 164 9307335 10 10 36 4 h EC 165Ho 5 2 165m1Er 551 3 6 keV 250 30 ns IT 165Er 11 2 165m2Er 1 8230 6 MeV 370 40 ns IT 165Er 19 2 166Er 68 98 165 9303011 4 Observationally Stable n 10 0 0 33503 36 167Er 68 99 166 9320562 3 Observationally Stable n 11 7 2 0 22869 9 167mEr 207 801 5 keV 2 269 6 s IT 167Er 1 2 168Er 68 100 167 93237828 28 Observationally Stable n 12 0 0 26978 18 168mEr 1 0940383 16 MeV 109 0 7 ns IT 168Er 4 169Er 68 101 168 9345984 3 9 392 18 d b 169Tm 1 2 169m1Er 92 05 10 keV 285 20 ns IT 169Er 5 2 169m2Er 243 69 17 keV 200 10 ns IT 169Er 7 2 170Er 68 102 169 9354719 15 Observationally Stable n 13 0 0 14910 36 171Er 68 103 170 93803746 15 7 516 2 h b 171Tm 5 2 171mEr 198 61 9 keV 210 10 ns IT 171Er 1 2 172Er 68 104 171 939363 4 49 3 5 h b 172Tm 0 172mEr 1 5009 3 MeV 579 62 ns IT 172Er 6 173Er 68 105 172 94240 21 1 434 17 min b 173Tm 7 2 174Er 68 106 173 94423 32 3 2 2 min b 174Tm 0 174mEr 1 1115 7 MeV 3 9 3 s IT 174Er 8 175Er 68 107 174 94777 43 1 2 3 min b 175Tm 9 2 176Er 68 108 175 94994 43 12 s gt 300 ns b 176Tm 0 177Er 68 109 176 95399 54 8 s gt 300 ns b 177Tm 1 2 178Er 68 110 177 95678 64 4 s gt 300 ns b 178Tm 0 179Er 68 111 178 96127 54 3 s gt 550 ns b 179Tm 3 2 b n 178Tm180Er 68 112 179 96438 54 2 s gt 550 ns b 180Tm 0 b n 179TmThis table header amp footer view mEr 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 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 transitionp Proton emission Bold symbol as daughter Daughter product is stable spin value Indicates spin with weak assignment arguments Believed to undergo a decay to 158Dy or b b to 162Dy with a half life over 140 1012 years Believed to undergo a decay to 160Dy or b b to 164Dy Believed to undergo a decay to 162Dy Believed to undergo a decay to 163Dy Believed to undergo a decay to 164Dy Believed to undergo a decay to 166Dy or b b to 170Yb with a half life over 410 1015 yearsErbium 169 EditThis section needs expansion with Usage in medicine ATC V10 You can help by adding to it October 2019 The radioactive isotope erbium 169 is sometimes used in radiopharmaceuticals References Edit Standard Atomic Weights Erbium CIAAW 1999 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 Wang Meng Huang W J Kondev F G Audi G Naimi S 2021 The AME 2020 atomic mass evaluation II Tables graphs and references Chinese Physics C 45 3 030003 doi 10 1088 1674 1137 abddaf Isotopic compositions and standard atomic masses from Kondev F G Wang M Huang W J Naimi S Audi G 2021 The NUBASE2020 evaluation of nuclear properties PDF Chinese Physics C 45 3 030001 doi 10 1088 1674 1137 abddae 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 Kondev F G Wang M Huang W J Naimi S Audi G 2021 The NUBASE2020 evaluation of nuclear properties PDF Chinese Physics C 45 3 030001 doi 10 1088 1674 1137 abddae 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 erbium amp oldid 1132078872, wikipedia, wiki, book, books, library,
