Isotopes of antimony
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Antimony (51Sb) occurs naturally as two stable isotopes, 121Sb (57.21%) and 123Sb (42.79%). There are 37 artificial radioactive isotopes known with mass numbers 104 to 142, the lightest two of which (104-105Sb) are beyond the proton drip line. Isotopes that are lighter than the stable isotopes tend to decay by β+, and those that are heavier tend to decay by β−; the intermediate 122Sb is observed to decay in both ways.
The longest-lived radioisotopes of antimony are: the minor fission product 125Sb, with a half-life of 2.758 years; 124Sb, with half-life 60.20 days; and 126Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour. Of the numerous isomers reported, the longest-lived is 120m1Sb with half-life 5.76 days; this nuclide has not been confirmed not to be the ground state.
List of isotopes
| Nuclide | Z | N | Isotopic mass (Da) | Discovery year | Half-life | Decay mode | Daughter isotope | Spin and parity | Natural abundance (mole fraction) | |
|---|---|---|---|---|---|---|---|---|---|---|
| Excitation energy | Normal proportion | Range of variation | ||||||||
| 104Sb | 51 | 53 | 103.936331(24) | 470(130) ms | β+? | 104Sn | ||||
| p (<7%) | 103Sn | |||||||||
| β+, p (<7%) | 103In | |||||||||
| α? | 100In | |||||||||
| 105Sb | 51 | 54 | 104.931277(23) | 1.12(16) s | β+ (>99.9%) | 105Sn | (5/2+) | |||
| p (<0.1%) | 104Sn | |||||||||
| β+, p? | 104In | |||||||||
| 106Sb | 51 | 55 | 105.9286380(80) | 0.6(2) s | β+ | 106Sn | (2+) | |||
| 106mSb | 103.5(3) keV | 226(14) ns | IT | 106Sb | (4+) | |||||
| 107Sb | 51 | 56 | 106.9241506(45) | 4.0(2) s | β+ | 107Sn | 5/2+# | |||
| 108Sb | 51 | 57 | 107.9222267(59) | 7.4(3) s | β+ | 108Sn | (4+) | |||
| 109Sb | 51 | 58 | 108.9181412(57) | 17.2(5) s | β+ | 109Sn | 5/2+# | |||
| 110Sb | 51 | 59 | 109.9168543(64) | 23.6(3) s | β+ | 110Sn | (3+) | |||
| 111Sb | 51 | 60 | 110.9132182(95) | 75(1) s | β+ | 111Sn | (5/2+) | |||
| 112Sb | 51 | 61 | 111.912400(19) | 53.5(6) s | β+ | 112Sn | (3+) | |||
| 112mSb | 825.9(4) keV | 536(22) ns | IT | 112Sb | (8−) | |||||
| 113Sb | 51 | 62 | 112.909375(18) | 6.67(7) min | β+ | 113Sn | 5/2+ | |||
| 114Sb | 51 | 63 | 113.909289(21) | 3.49(3) min | β+ | 114Sn | 3+ | |||
| 114mSb | 495.5(7) keV | 219(12) μs | IT | 114Sb | (8−) | |||||
| 115Sb | 51 | 64 | 114.906598(17) | 32.1(3) min | β+ | 115Sn | 5/2+ | |||
| 115mSb | 2796.26(9) keV | 159(3) ns | IT | 115Sb | (19/2)− | |||||
| 116Sb | 51 | 65 | 115.9067927(55) | 15.8(8) min | β+ | 116Sn | 3+ | |||
| 116m1Sb | 93.99(5) keV | 194(4) ns | IT | 116Sb | 1+ | |||||
| 116m2Sb | 390(40) keV | 60.3(6) min | β+ | 116Sn | 8− | |||||
| 117Sb | 51 | 66 | 116.9048415(91) | 2.97(2) h | β+ | 117Sn | 5/2+ | |||
| 117m1Sb | 3130.76(19) keV | 355(17) μs | IT | 117Sb | (25/2)+ | |||||
| 117m2Sb | 3230.7(2) keV | 290(5) ns | IT | 117Sb | (23/2−) | |||||
| 118Sb | 51 | 67 | 117.9055322(32) | 3.6(1) min | β+ | 118Sn | 1+ | |||
| 118m1Sb | 50.814(21) keV | 20.6(6) μs | IT | 118Sb | 3+ | |||||
| 118m2Sb | 250(6) keV | 5.01(3) h | β+ | 118Sn | 8− | |||||
| 119Sb | 51 | 68 | 118.9039441(75) | 38.19(22) h | EC | 119Sn | 5/2+ | |||
| 119m1Sb | 2553.6(3) keV | 130(3) ns | IT | 119Sb | 19/2− | |||||
| 119m2Sb | 2841.7(4) keV | 835(81) ms | IT | 119Sb | 25/2+ | |||||
| 120Sb | 51 | 69 | 119.9050803(77) | 15.89(4) min | β+ | 120Sn | 1+ | |||
| 120m1Sb | 0(100)# keV | 5.76(2) d | β+ | 120Sn | 8− | |||||
| 120m2Sb | 78.16(5) keV | 246(2) ns | IT | 120Sb | (3+) | |||||
| 120m3Sb | 2328(100)# keV | 400(8) ns | IT | 120Sb | 13+ | |||||
| 121Sb | 51 | 70 | 120.9038114(27) | Stable | 5/2+ | 0.5721(5) | ||||
| 121mSb | 2751(17) keV | 179(6) μs | IT | 121Sb | (25/2+) | |||||
| 122Sb | 51 | 71 | 121.9051693(27) | 2.7238(2) d | β− (97.59%) | 122Te | 2− | |||
| β+ (2.41%) | 122Sn | |||||||||
| 122m1Sb | 61.4131(5) keV | 1.86(8) μs | IT | 122Sb | 3+ | |||||
| 122m2Sb | 137.4726(8) keV | 0.53(3) ms | IT | 122Sb | 5+ | |||||
| 122m3Sb | 163.5591(17) keV | 4.191(3) min | IT | 122Sb | 8− | |||||
| 123Sb | 51 | 72 | 122.9042153(15) | Stable | 7/2+ | 0.4279(5) | ||||
| 123m1Sb | 2237.8(3) keV | 214(3) ns | IT | 123Sb | 19/2− | |||||
| 123m2Sb | 2613.4(4) keV | 65(1) μs | IT | 123Sb | 23/2+ | |||||
| 124Sb | 51 | 73 | 123.9059371(15) | 60.20(3) d | β− | 124Te | 3− | |||
| 124m1Sb | 10.8627(8) keV | 93(5) s | IT (75%) | 124Sb | 5+ | |||||
| β− (25%) | 124Te | |||||||||
| 124m2Sb | 36.8440(14) keV | 20.2(2) min | IT | 124m1Sb | (8)− | |||||
| 124m3Sb | 40.8038(7) keV | 3.2(3) μs | IT | 124Sb | (3+) | |||||
| 125Sb | 51 | 74 | 124.9052543(27) | 2.7576(11) y | β− | 125Te | 7/2+ | |||
| 125m1Sb | 1971.25(20) keV | 4.1(2) μs | IT | 125Sb | 15/2− | |||||
| 125m2Sb | 2112.1(3) keV | 28.5(5) μs | IT | 125Sb | 19/2− | |||||
| 125m3Sb | 2471.0(4) keV | 277.0(64) ns | IT | 125Sb | (23/2)+ | |||||
| 126Sb | 51 | 75 | 125.907253(34) | 12.35(6) d | β− | 126Te | 8− | |||
| 126m1Sb | 17.7(3) keV | 19.15(8) min | β− (86%) | 126Te | 5+ | |||||
| IT (14%) | 126Sb | |||||||||
| 126m2Sb | 40.4(3) keV | ~11 s | IT | 126m1Sb | 3− | |||||
| 126m3Sb | 104.6(3) keV | 553(5) ns | IT | 126Sb | 3+ | |||||
| 126m4Sb | 1810.7(17) keV | 90(16) ns | IT | 126Sb | (13+) | |||||
| 127Sb | 51 | 76 | 126.9069256(55) | 3.85(5) d | β− | 127Te | 7/2+ | |||
| 127m1Sb | 1920.19(21) keV | 11.7(1) μs | IT | 127Sb | 15/2− | |||||
| 127m2Sb | 2324.7(4) keV | 269(5) ns | IT | 127Sb | 23/2+ | |||||
| 128Sb | 51 | 77 | 127.909146(20) | 9.05(4) h | β− | 128Te | 8− | |||
| 128m1Sb | 10(6) keV | 10.41(18) min | β− (96.4%) | 128Te | 5+ | |||||
| IT (3.6%) | 128Sb | |||||||||
| 128m2Sb | 1617.3(7) keV | 500(20) ns | IT | 128Sb | (11+) | |||||
| 128m3Sb | 1769.9(12) keV | 217(7) ns | IT | 128Sb | (13+) | |||||
| 129Sb | 51 | 78 | 128.909147(23) | 4.366(26) h | β− | 129Te | 7/2+ | |||
| 129m1Sb | 1851.31(6) keV | 17.7(1) min | β− (85%) | 129Te | 19/2− | |||||
| IT (15%) | 129Sb | |||||||||
| 129m2Sb | 1861.06(5) keV | 2.23(17) μs | IT | 129Sb | 15/2− | |||||
| 129m3Sb | 2139.4(3) keV | 0.89(3) μs | IT | 129Sb | 23/2+ | |||||
| 130Sb | 51 | 79 | 129.911663(15) | 39.5(8) min | β− | 130Te | 8− | |||
| 130m1Sb | 4.80(20) keV | 6.3(2) min | β− | 130Te | 4+ | |||||
| 130m2Sb | 84.67(4) keV | 800(100) ns | IT | 130Sb | 6− | |||||
| 130m3Sb | 1508(1) keV | 600(15) ns | IT | 130Sb | (11+) | |||||
| 130m4Sb | 1544.7(5) keV | 1.25(1) μs | IT | 130Sb | (13+) | |||||
| 131Sb | 51 | 80 | 130.9119893(22) | 23.03(4) min | β− | 131Te | 7/2+ | |||
| 131m1Sb | 1676.06(6) keV | 64.2(26) μs | IT | 131Sb | 15/2− | |||||
| 131m2Sb | 1687.2(9) keV | 4.3(8) μs | IT | 131Sb | 19/2− | |||||
| 131m3Sb | 2165.6(15) keV | 0.97(3) μs | IT | 131Sb | 23/2+ | |||||
| 132Sb | 51 | 81 | 131.9145141(29) | 2.79(7) min | β− | 132Te | (4)+ | |||
| 132m1Sb | 139.3(20) keV | 4.10(5) min | β− | 132Te | (8−) | |||||
| 132m2Sb | 254.5(3) keV | 102(4) ns | IT | 132Sb | (6−) | |||||
| 133Sb | 51 | 82 | 132.9152721(34) | 2.34(5) min | β− | 133Te | (7/2+) | |||
| 133mSb | 4541(9) keV | 16.54(19) μs | IT | 133Sb | (21/2+) | |||||
| 134Sb | 51 | 83 | 133.9205373(33) | 674(4) ms | β− | 134Te | (0-) | |||
| β−, n? | 133Te | |||||||||
| 134mSb | 279(1) keV | 10.01(4) s | β− (99.91%) | 134Te | (7−) | |||||
| β−, n (0.088%) | 133Te | |||||||||
| 135Sb | 51 | 84 | 134.9251844(28) | 1.668(9) s | β− (80.9%) | 135Te | (7/2+) | |||
| β−, n (19.1%) | 134Te | |||||||||
| 136Sb | 51 | 85 | 135.9307490(63) | 0.923(14) s | β− (75.2%) | 136Te | (1−) | |||
| β−, n (24.7%) | 135Te | |||||||||
| β−, 2n (0.14%) | 134Te | |||||||||
| 136mSb | 269.3(5) keV | 570(5) ns | IT | 136Sb | (6−) | |||||
| 137Sb | 51 | 86 | 136.935523(56) | 497(21) ms | β− (51%) | 137Te | 7/2+# | |||
| β−, n (49%) | 136Te | |||||||||
| β−, 2n? | 135Te | |||||||||
| 138Sb | 51 | 87 | 137.94133(32)# | 333(7) ms | β−, n (72%) | 137Te | (3−) | |||
| β− (28%) | 138Te | |||||||||
| β−, 2n? | 136Te | |||||||||
| 139Sb | 51 | 88 | 138.94627(43)# | 182(9) ms | β−, n (90%) | 138Te | 7/2+# | |||
| β− (10%) | 139Te | |||||||||
| β−, 2n? | 137Te | |||||||||
| 140Sb | 51 | 89 | 139.95235(64)# | 170(6) ms | β− (69%) | 140Te | (3−) | |||
| β−, n (23%) | 139Te | |||||||||
| β−, 2n (7.6%) | 138Te | |||||||||
| 140mSb | 330(30)# keV | 41(8) μs | IT | 140Sb | (6−,7−) | |||||
| 141Sb | 51 | 90 | 140.95755(54)# | 103(29) ms | β− | 141Te | 7/2+# | |||
| β−, n? | 140Te | |||||||||
| β−, 2n? | 139Te | |||||||||
| 142Sb | 51 | 91 | 141.96392(32)# | 80(50) ms | β− | 142Te | ||||
| β−, n? | 141Te | |||||||||
| β−, 2n? | 140Te | |||||||||
| This table header & footer: view |
See also
Daughter products other than antimony
- Isotope masses from: Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), , Nuclear Physics A, 729: 3–128, Bibcode:, doi:
- 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). . Pure and Applied Chemistry. 75 (6): 683–800. doi:. Wieser, Michael E. (2006). . Pure and Applied Chemistry. 78 (11): 2051–2066. doi:.
- . 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), , Nuclear Physics A, 729: 3–128, Bibcode:, doi: National Nuclear Data Center. . 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.