Isotopes of erbium

{{Short description|none}} {{Infobox erbium isotopes}} Naturally occurring erbium (₆₈Er) is composed of six stable isotopes, with ¹⁶⁶Er being the most abundant (33.503% natural abundance). Radioisotopes have been characterized with from ¹⁴⁵Er to ¹⁷⁵Er, all having half-lives less than ten days: the most stable are ¹⁶⁹Er (9.39 days), ¹⁷²Er (49.3 hours), and ¹⁶⁰Er (28.58 hours). All of the remaining radioactive isotopes have half-lives that are less than 11 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 ^149m1Er (t_1/2 = 8.9 seconds).

The primary decay mode before the most abundant stable isotope, ¹⁶⁶Er, is electron capture to holmium isotopes, and the primary mode after is beta decay to 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 == {{Anchor}} <!--Please delete anchor(s) from the list above or table below if adding a dedicated isotope section(s).--> {{Isotopes table |symbol=Er |refs=NUBASE2020, AME2020 II, <!-- updated as of 2022-02-06 --> IsotopeFRIB, IsomerFRIB |notes=m, unc(), hl#, mass#, exen#, spin(), spin#, daughter-st, EC, IT, p, discoveryname }} |-id=Erbium-143 | ¹⁴³Er | style="text-align:right" | 68 | style="text-align:right" | 75 | 142.96655(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/143.pdf 2026] | 200#&nbsp;ms | | | 9/2−# | | |-id=Erbium-144 | ¹⁴⁴Er | style="text-align:right" | 68 | style="text-align:right" | 76 | 143.96070(21)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/144.pdf 2003] | 400#&nbsp;ms{{br}}[>&nbsp;200&nbsp;ns] | | | 0+ | | |-id=Erbium-145 | rowspan=2| ¹⁴⁵Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 77 | rowspan=2| 144.95787(22)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/145.pdf 1989] | rowspan=2| 900(200)&nbsp;ms | β⁺ | ¹⁴⁵Ho | rowspan=2|1/2+# | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁴Dy |-id=Erbium-145m | rowspan=2 style="text-indent:1em" | ^145mEr | rowspan=2 colspan="3" style="text-indent:2em" | 205(4)#&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/145Er-1.pdf 2003] | rowspan=2| 1.0(3)&nbsp;s | β⁺ | ¹⁴⁵Ho | rowspan=2| (11/2-) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁴Dy |-id=Erbium-146 | rowspan=2|¹⁴⁶Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 78 | rowspan=2|145.952418(7) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/146.pdf 1993] | rowspan=2|1.7(6)&nbsp;s | β⁺ | ¹⁴⁶Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁵Dy |-id=Erbium-147 | rowspan=2|¹⁴⁷Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 79 | rowspan=2|146.94996(4)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/147.pdf 1992] | rowspan=2|3.2(12)&nbsp;s | β⁺ | ¹⁴⁷Ho | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁶Dy |-id=Erbium-147m | rowspan=2 style="text-indent:1em" | ^147mEr<ref group="n" name="order">Order of ground state and isomer is uncertain.</ref> | rowspan=2 colspan="3" style="text-indent:2em" | 100(50)#&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/147Er-1.pdf 2010] | rowspan=2| 1.6(2)&nbsp;s | β⁺ | ¹⁴⁷Ho | rowspan=2| (11/2−) | rowspan=2| | rowspan=2| |- | β⁺, p (?%) | ¹⁴⁶Dy |-id=Erbium-148 | rowspan=2|¹⁴⁸Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 80 | rowspan=2|147.944735(11)# | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/148.pdf 1982] | rowspan=2|4.6(2)&nbsp;s | β⁺ (99.85%) | ¹⁴⁸Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺, p (0.15%) | ¹⁴⁷Dy |-id=Erbium-148m | style="text-indent:1em" | ^148mEr | colspan="3" style="text-indent:2em" | 2913,2(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/148Er-1.pdf 1982] | 13(3)&nbsp;μs | IT | ¹⁴⁸Er | (10+) | | |-id=Erbium-149 | rowspan=2|¹⁴⁹Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 81 | rowspan=2|148.94231(3) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/149.pdf 1984] | rowspan=2|4(2)&nbsp;s | β⁺ (93%) | ¹⁴⁹Ho | rowspan=2|(1/2+) | rowspan=2| | rowspan=2| |- | β⁺, p (7%) | ¹⁴⁸Dy |-id=Erbium-149m1 | rowspan=3 style="text-indent:1em" | ^149m1Er | rowspan=3 colspan="3" style="text-indent:2em" | 741.8(2)&nbsp;keV | rowspan=3 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/149Er-1.pdf 1985] | rowspan=3|8.9(2)&nbsp;s | β⁺ (96.3%) | ¹⁴⁹Ho | rowspan=3|(11/2−) | rowspan=3| | rowspan=3| |- | IT (3.5%) | ¹⁴⁹Er |- | β⁺, p (0.18%) | ¹⁴⁸Dy |-id=Erbium-149m2 | style="text-indent:1em" | ^149m2Er | colspan="3" style="text-indent:2em" | 2611.1(3)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/149Er-3.pdf 1987] | 0.61(8)&nbsp;μs | IT | ¹⁴⁹Er | (19/2+) | | |-id=Erbium-149m3 | style="text-indent:1em" | ^149m3Er | colspan="3" style="text-indent:2em" | 3302(7)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/149Er-2.pdf 1987] | 4.8(1)&nbsp;μs | IT | ¹⁴⁹Er | (27/2−) | | |-id=Erbium-150 | ¹⁵⁰Er | style="text-align:right" | 68 | style="text-align:right" | 82 | 149.937916(18) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/150.pdf 1982] | 18.5(7)&nbsp;s | β⁺ | ¹⁵⁰Ho | 0+ | | |-id=Erbium-150m | style="text-indent:1em" | ^150mEr | colspan="3" style="text-indent:2em" | 2796.5(5)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/150Er-1.pdf 1982] | 2.55(10)&nbsp;μs | IT | ¹⁵⁰Er | 10+ | | |-id=Erbium-151 | ¹⁵¹Er | style="text-align:right" | 68 | style="text-align:right" | 83 | 150.937449(18) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/151.pdf 1970] | 23.5(20)&nbsp;s | β⁺ | ¹⁵¹Ho | (7/2−) | | |-id=Erbium-151m1 | rowspan=2 style="text-indent:1em" | ^151m1Er | rowspan=2 colspan="3" style="text-indent:2em" | 2586.0(5)&nbsp;keV | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/151Er-1.pdf 1980] | rowspan=2|580(20)&nbsp;ms | IT (95.3%) | ¹⁵¹Er | rowspan=2|(27/2−) | rowspan=2| | rowspan=2| |- | β⁺ (4.7%) | ¹⁵¹Ho |-id=Erbium-151m2 | style="text-indent:1em" | ^151m2Er | colspan="3" style="text-indent:2em" | 10286.6(10)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/151Er-2.pdf 1990] | 0.42(5)&nbsp;μs | IT | ¹⁵¹Er | (65/2-, 61/2+) | | |-id=Erbium-152 | rowspan=2|¹⁵²Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 84 | rowspan=2|151.935050(9) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/152.pdf 1963] | rowspan=2|10.3(1)&nbsp;s | α (90%) | ¹⁴⁸Dy | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β⁺ (10%) | ¹⁵²Ho |-id=Erbium-153 | rowspan=2|¹⁵³Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 85 | rowspan=2|152.935086(10) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/153.pdf 1963] | rowspan=2|37.1(2)&nbsp;s | α (53%) | ¹⁴⁹Dy | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | β⁺ (47%) | ¹⁵³Ho |-id=Erbium-153m1 | style="text-indent:1em" | ^153m1Er | colspan="3" style="text-indent:2em" | 2798.2(10)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/153Er-1.pdf 1979] | 373(9)&nbsp;ns | IT | ¹⁵³Er | (27/2-) | | |-id=Erbium-153m2 | style="text-indent:1em" | ^153m2Er | colspan="3" style="text-indent:2em" | 5248.1(10)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/153Er-2.pdf 1980] | 248(32)&nbsp;ns | IT | ¹⁵³Er | (41/2-) | | |-id=Erbium-154 | rowspan=2|¹⁵⁴Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 86 | rowspan=2|153.932791(5) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/154.pdf 1963] | rowspan=2|3.73(9)&nbsp;min | β⁺ (99.53%) | ¹⁵⁴Ho | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | α (0.47%) | ¹⁵⁰Dy |-id=Erbium-155 | rowspan=2|¹⁵⁵Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 87 | rowspan=2|154.933216(7) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/155.pdf 1969] | rowspan=2|5.3(3)&nbsp;min | β⁺ (99.978%) | ¹⁵⁵Ho | rowspan=2|7/2− | rowspan=2| | rowspan=2| |- | α (0.022%) | ¹⁵¹Dy |-id=Erbium-156 | rowspan=2| ¹⁵⁶Er | rowspan=2 style="text-align:right" | 68 | rowspan=2 style="text-align:right" | 88 | rowspan=2| 155.931066(26) | rowspan=2 style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/156.pdf 1967] | rowspan=2| 19.5(10)&nbsp;min | β⁺ | ¹⁵⁶Ho | rowspan=2| 0+ | rowspan=2| | rowspan=2| |- | α (1.2{{e|−5}}%) | ¹⁵²Dy |-id=Erbium-157 | ¹⁵⁷Er | style="text-align:right" | 68 | style="text-align:right" | 89 | 156.931923(28) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/157.pdf 1965] | 18.65(10)&nbsp;min | β⁺ | ¹⁵⁷Ho | 3/2− | | |-id=Erbium-157m | style="text-indent:1em" | ^157mEr | colspan="3" style="text-indent:2em" | 155.4(3)&nbsp;keV | style="text-align:center" | (1971)<ref group="n" | name="conf">Only published in a conference proceeding and not a refereed journal.</ref> | 76(6)&nbsp;ms | IT | ¹⁵⁷Er | 9/2+ | | |-id=Erbium-158 | ¹⁵⁸Er | style="text-align:right" | 68 | style="text-align:right" | 90 | 157.929893(27) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/158.pdf 1960] | 2.29(6)&nbsp;h | EC | ¹⁵⁸Ho | 0+ | | |-id=Erbium-159 | ¹⁵⁹Er | style="text-align:right" | 68 | style="text-align:right" | 91 | 158.930691(4) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/159.pdf 1961] | 36(1)&nbsp;min | β⁺ | ¹⁵⁹Ho | 3/2− | | |-id=Erbium-159m1 | style="text-indent:1em" | ^159m1Er | colspan="3" style="text-indent:2em" | 182.602(24)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/159Er-2.pdf 1975] | 337(14)&nbsp;ns | IT | ¹⁵⁹Er | 9/2+ | | |-id=Erbium-159m2 | style="text-indent:1em" | ^159m2Er | colspan="3" style="text-indent:2em" | 429.05(3)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/159Er-1.pdf 1975] | 590(60)&nbsp;ns | IT | ¹⁵⁹Er | 11/2− | | |-id=Erbium-160 | ¹⁶⁰Er | style="text-align:right" | 68 | style="text-align:right" | 92 | 159.929077(26) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/160.pdf 1954] | 28.58(9)&nbsp;h | EC | ¹⁶⁰Ho | 0+ | | |-id=Erbium-161 | ¹⁶¹Er | style="text-align:right" | 68 | style="text-align:right" | 93 | 160.930004(9) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/161.pdf 1954] | 3.21(3)&nbsp;h | β⁺ | ¹⁶¹Ho | 3/2− | | |-id=Erbium-161m | style="text-indent:1em" | ^161mEr | colspan="3" style="text-indent:2em" | 396.44(4)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/161Er-1.pdf 1969] | 7.5(7)&nbsp;μs | IT | ¹⁶¹Er | 11/2− | | |-id=Erbium-162 | ¹⁶²Er | style="text-align:right" | 68 | style="text-align:right" | 94 | 161.9287873(8) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/162.pdf 1938] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to '''¹⁵⁸Dy''' or β⁺β⁺ to '''¹⁶²Dy''' with a half-life over 1.40{{e|14}} years</ref> | 0+ | 0.00139(5) | |-id=Erbium-162m | style="text-indent:1em" | ^162mEr | colspan="3" style="text-indent:2em" | 2026.01(13)&nbsp;keV | style="text-align:center" | (2012)<ref group="n">Half-life shorter than 100ns, not included in discovery database</ref> | 88(16)&nbsp;ns | IT | '''¹⁶²Er''' | 7(-) | | |-id=Erbium-163 | ¹⁶³Er | style="text-align:right" | 68 | style="text-align:right" | 95 | 162.930040(5) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/163.pdf 1953] | 75.0(4)&nbsp;min | β⁺ | ¹⁶³Ho | 5/2− | | |-id=Erbium-163m | style="text-indent:1em" | ^163mEr | colspan="3" style="text-indent:2em" | 445.5(6)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/163Er-1.pdf 1970] | 580(100)&nbsp;ns | IT | ¹⁶³Er | (11/2−) | | |-id=Erbium-164 | ¹⁶⁴Er | style="text-align:right" | 68 | style="text-align:right" | 96 | 163.9292077(8) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/164.pdf 1938] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to '''¹⁶⁰Dy''' or β⁺β⁺ to '''¹⁶⁴Dy'''</ref> | 0+ | 0.01601(3) | |-id=Erbium-165 | ¹⁶⁵Er | style="text-align:right" | 68 | style="text-align:right" | 97 | 164.9307335(10) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/165.pdf 1950] | 10.36(4)&nbsp;h | EC | '''¹⁶⁵Ho''' | 5/2− | | |-id=Erbium-165m1 | style="text-indent:1em" | ^165m1Er | colspan="3" style="text-indent:2em" | 551.3(6)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/165Er-1.pdf 1974] | 250(30)&nbsp;ns | IT | ¹⁶⁵Er | 11/2- | | |-id=Erbium-165m2 | style="text-indent:1em" | ^165m2Er | colspan="3" style="text-indent:2em" | 1823.0(6)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/165Er-2.pdf 2012] | 370(40)&nbsp;ns | IT | ¹⁶⁵Er | (19/2) | | |-id=Erbium-166 | ¹⁶⁶Er | style="text-align:right" | 68 | style="text-align:right" | 98 | 165.9303011(4) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/166.pdf 1934] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to '''¹⁶²Dy'''</ref> | 0+ | 0.33503(36) | |-id=Erbium-167 | ¹⁶⁷Er | style="text-align:right" | 68 | style="text-align:right" | 99 | 166.9320562(3) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/167.pdf 1934] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to '''¹⁶³Dy'''</ref> | 7/2+ | 0.22869(9) | |-id=Erbium-167m | style="text-indent:1em" | ^167mEr | colspan="3" style="text-indent:2em" | 207.801(5)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/167Er-1.pdf 1963] | 2.269(6)&nbsp;s | IT | '''¹⁶⁷Er''' | 1/2− | | |-id=Erbium-168 | ¹⁶⁸Er | style="text-align:right" | 68 | style="text-align:right" | 100 | 167.93237828(28) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/168.pdf 1934] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to '''¹⁶⁴Dy'''</ref> | 0+ | 0.26978(18) | |-id=Erbium-168m | style="text-indent:1em" | ^168mEr | colspan="3" style="text-indent:2em" | 1094.0383(16)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/168Er-1.pdf 1957] | 109.0(7)&nbsp;ns | IT | '''¹⁶⁸Er''' | 4- | | |-id=Erbium-169 | ¹⁶⁹Er | style="text-align:right" | 68 | style="text-align:right" | 101 | 168.9345984(3) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/169.pdf 1956] | 9.392(18)&nbsp;d | β⁻ | '''¹⁶⁹Tm''' | 1/2− | | |-id=Erbium-169m1 | style="text-indent:1em" | ^169m1Er | colspan="3" style="text-indent:2em" | 92.05(10)&nbsp;keV | style="text-align:center" | (1969)<ref group="n" name=conf /> | 285(20)&nbsp;ns | IT | ¹⁶⁹Er | (5/2)- | | |-id=Erbium-169m2 | style="text-indent:1em" | ^169m2Er | colspan="3" style="text-indent:2em" | 243.69(17)&nbsp;keV | style="text-align:center" | (1969)<ref group="n" name=conf /> | 200(10)&nbsp;ns | IT | ¹⁶⁹Er | 7/2+ | | |-id=Erbium-170 | ¹⁷⁰Er | style="text-align:right" | 68 | style="text-align:right" | 102 | 169.9354719(15) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/170.pdf 1934] | colspan=3 align=center|'''Observationally Stable'''<ref group="n">Believed to undergo α decay to ¹⁶⁶Dy or β⁻β⁻ to '''¹⁷⁰Yb''' with a half-life over 4.10{{e|17}} years</ref> | 0+ | 0.14910(36) | |-id=Erbium-171 | ¹⁷¹Er | style="text-align:right" | 68 | style="text-align:right" | 103 | 170.9380374(15) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/171.pdf 1938] | 7.516(2)&nbsp;h | β⁻ | ¹⁷¹Tm | 5/2− | | |-id=Erbium-171m | style="text-indent:1em" | ^171mEr | colspan="3" style="text-indent:2em" | 198.61(9)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/171Er-1.pdf 1990] | 210(10)&nbsp;ns | IT | ¹⁷¹Er | 1/2− | | |-id=Erbium-172 | ¹⁷²Er | style="text-align:right" | 68 | style="text-align:right" | 104 | 171.939363(4) | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/172.pdf 1956] | 49.3(5)&nbsp;h | β⁻ | ¹⁷²Tm | 0+ | | |- |-id=Erbium-172m | style="text-indent:1em" | ^172mEr | colspan="3" style="text-indent:2em" | 1500,9(3)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/172Er-1.pdf 2006] | 579(62)&nbsp;ns | IT | ¹⁷²Er | (6+) | | |-id=Erbium-173 | ¹⁷³Er | style="text-align:right" | 68 | style="text-align:right" | 105 | 172.94240(21)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/173.pdf 1972] | 1.434(17)&nbsp;min | β⁻ | ¹⁷³Tm | (7/2−) | | |-id=Erbium-174 | ¹⁷⁴Er | style="text-align:right" | 68 | style="text-align:right" | 106 | 173.94423(32)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/174.pdf 1989] | 3.2(2)&nbsp;min | β⁻ | ¹⁷⁴Tm | 0+ | | |-id=Erbium-174m | style="text-indent:1em" | ^174mEr | colspan="3" style="text-indent:2em" | 1111.5(7)&nbsp;keV | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/isomers/abstracts/68/174Er-1.pdf 2006] | 3.9(3)&nbsp;s | IT | ¹⁷⁴Er | 8- | | |-id=Erbium-175 | ¹⁷⁵Er | style="text-align:right" | 68 | style="text-align:right" | 107 | 174.94777(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/175.pdf 1996] | 1.2(3)&nbsp;min | β⁻ | ¹⁷⁵Tm | 9/2+# | | |-id=Erbium-176 | ¹⁷⁶Er | style="text-align:right" | 68 | style="text-align:right" | 108 | 175.94994(43)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/176.pdf 2012] | 12#&nbsp;s{{br}}[>300&nbsp;ns] | | | 0+ | | |-id=Erbium-177 | ¹⁷⁷Er | style="text-align:right" | 68 | style="text-align:right" | 109 | 176.95399(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/177.pdf 2012] | 8#&nbsp;s{{br}}[>300&nbsp;ns] | | | 1/2−# | | |-id=Erbium-178 | ¹⁷⁸Er | style="text-align:right" | 68 | style="text-align:right" | 110 | 177.95678(64)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/178.pdf 2012] | 4#&nbsp;s{{br}}[>300&nbsp;ns] | | | 0+ | | |-id=Erbium-179 | ¹⁷⁹Er | style="text-align:right" | 68 | style="text-align:right" | 111 | 178.96127(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/179.pdf 2018] | 3#&nbsp;s{{br}}[>550&nbsp;ns)] | | | 3/2−# | | |-id=Erbium-180 | ¹⁸⁰Er | style="text-align:right" | 68 | style="text-align:right" | 112 | 179.96438(54)# | style="text-align:center" | [https://www.nndc.bnl.gov/discovery/abstracts/68/180.pdf 2018] | 2#&nbsp;s{{br}}[>550&nbsp;ns] | | | 0+ | | {{Isotopes table/footer}}

== See also == '''Daughter products other than erbium''' * Isotopes of thulium * Isotopes of holmium * Isotopes of dysprosium

== References == {{reflist}} * Isotope masses from: ** {{AME2020 II}} * Isotopic compositions and standard atomic masses from: ** {{NUBASE2020}} ** {{CIAAW2003}} ** {{CIAAW 2005}} * Half-life, spin, and isomer data selected from the following sources. ** {{NUBASE2020}} ** {{NNDC}} ** {{CRC85|chapter=11}}

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Category:Isotopes of erbium Category:Erbium Erbium