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Nuclides with atomic number of 51 but with different mass numbers From Wikipedia, the free encyclopedia
Antimony (51Sb) occurs in two stable isotopes, 121Sb and 123Sb. There are 35 artificial radioactive isotopes, the longest-lived of which are 125Sb, with a half-life of 2.75856 years; 124Sb, with a half-life of 60.2 days; and 126Sb, with a half-life of 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour.
There are also many isomers, the longest-lived of which is 120m1Sb with a half-life of 5.76 days.
With the exception of beryllium, antimony is the lightest element observed to have isotopes capable of undergoing alpha decay, with the isotope 104Sb being seen to undergo this mode of decay. Some lighter elements, namely those in the vicinity of 8Be, have isotopes with delayed alpha emission (following proton or beta emission) as a rare branch.
Nuclide [n 1] |
Z | N | Isotopic mass (Da) [n 2][n 3] |
Half-life |
Decay mode [n 4] |
Daughter isotope [n 5][n 6] |
Spin and parity [n 7][n 8] |
Natural abundance (mole fraction) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 8] | Normal proportion | Range of variation | |||||||||||||||||
103Sb | 51 | 52 | 102.93969(32)# | 100# ms [>1.5 μs] | β+ | 103Sn | 5/2+# | ||||||||||||
104Sb | 51 | 53 | 103.93647(39)# | 0.47(13) s [0.44(+15−11) s] |
β+ (86%) | 104Sn | |||||||||||||
p (7%) | 103Sn | ||||||||||||||||||
β+, p (7%) | 103In | ||||||||||||||||||
α (<1%) | 100In | ||||||||||||||||||
105Sb | 51 | 54 | 104.93149(11) | 1.12(16) s | β+ (99%) | 105Sn | (5/2+) | ||||||||||||
p (1%) | 104Sn | ||||||||||||||||||
β+, p (<1%) | 104In | ||||||||||||||||||
106Sb | 51 | 55 | 105.92879(34)# | 0.6(2) s | β+ | 106Sn | (4+) | ||||||||||||
106mSb | 1000(500)# keV | 220(20) ns | |||||||||||||||||
107Sb | 51 | 56 | 106.92415(32)# | 4.0(2) s | β+ | 107Sn | 5/2+# | ||||||||||||
108Sb | 51 | 57 | 107.92216(22)# | 7.4(3) s | β+ | 108Sn | (4+) | ||||||||||||
β+, p (rare) | 107In | ||||||||||||||||||
109Sb | 51 | 58 | 108.918132(20) | 17.3(5) s | β+ | 109Sn | 5/2+# | ||||||||||||
110Sb | 51 | 59 | 109.91675(22)# | 23.0(4) s | β+ | 110Sn | (4+) | ||||||||||||
111Sb | 51 | 60 | 110.91316(3) | 75(1) s | β+ | 111Sn | (5/2+) | ||||||||||||
112Sb | 51 | 61 | 111.912398(19) | 51.4(10) s | β+ | 112Sn | 3+ | ||||||||||||
113Sb | 51 | 62 | 112.909372(19) | 6.67(7) min | β+ | 113Sn | 5/2+ | ||||||||||||
114Sb | 51 | 63 | 113.90927(3) | 3.49(3) min | β+ | 114Sn | (3+) | ||||||||||||
114mSb | 495.5(7) keV | 219(12) μs | (8−) | ||||||||||||||||
115Sb | 51 | 64 | 114.906598(17) | 32.1(3) min | β+ | 115Sn | 5/2+ | ||||||||||||
116Sb | 51 | 65 | 115.906794(6) | 15.8(8) min | β+ | 116Sn | 3+ | ||||||||||||
116m1Sb | 93.99(5) keV | 194(4) ns | 1+ | ||||||||||||||||
116m2Sb | 380(40) keV | 60.3(6) min | β+ | 116Sn | 8− | ||||||||||||||
117Sb | 51 | 66 | 116.904836(10) | 2.80(1) h | β+ | 117Sn | 5/2+ | ||||||||||||
118Sb | 51 | 67 | 117.905529(4) | 3.6(1) min | β+ | 118Sn | 1+ | ||||||||||||
118m1Sb | 50.814(21) keV | 20.6(6) μs | (3)+ | ||||||||||||||||
118m2Sb | 250(6) keV | 5.00(2) h | β+ | 118Sn | 8− | ||||||||||||||
119Sb | 51 | 68 | 118.903942(9) | 38.19(22) h | EC | 119Sn | 5/2+ | ||||||||||||
119m1Sb | 2553.6(3) keV | 130(3) ns | (19/2−) | ||||||||||||||||
119m2Sb | 2852(7) keV | 850(90) ms | IT | 119Sb | 27/2+# | ||||||||||||||
120Sb | 51 | 69 | 119.905072(8) | 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 | (3+) | ||||||||||||||||
120m3Sb | 2328.3(6) keV | 400(8) ns | (6) | ||||||||||||||||
121Sb[n 9] | 51 | 70 | 120.9038157(24) | Stable | 5/2+ | 0.5721(5) | |||||||||||||
122Sb | 51 | 71 | 121.9051737(24) | 2.7238(2) d | β− (97.59%) | 122Te | 2− | ||||||||||||
β+ (2.41%) | 122Sn | ||||||||||||||||||
122m1Sb | 61.4131(5) keV | 1.86(8) μs | 3+ | ||||||||||||||||
122m2Sb | 137.4726(8) keV | 0.53(3) ms | (5)+ | ||||||||||||||||
122m3Sb | 163.5591(17) keV | 4.191(3) min | IT | 122Sb | (8)− | ||||||||||||||
123Sb[n 9] | 51 | 72 | 122.9042140(22) | Stable | 7/2+ | 0.4279(5) | |||||||||||||
124Sb | 51 | 73 | 123.9059357(22) | 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 | (8)− | ||||||||||||||||
124m3Sb | 40.8038(7) keV | 3.2(3) μs | (3+, 4+) | ||||||||||||||||
125Sb | 51 | 74 | 124.9052538(28) | 2.75856(25) y | β− | 125mTe | 7/2+ | ||||||||||||
126Sb | 51 | 75 | 125.90725(3) | 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 | (3+) | ||||||||||||||||
127Sb | 51 | 76 | 126.906924(6) | 3.85(5) d | β− | 127mTe | 7/2+ | ||||||||||||
128Sb | 51 | 77 | 127.909169(27) | 9.01(4) h | β− | 128Te | 8− | ||||||||||||
128mSb | 10(7) keV | 10.4(2) min | β− (96.4%) | 128Te | 5+ | ||||||||||||||
IT (3.6%) | 128Sb | ||||||||||||||||||
129Sb | 51 | 78 | 128.909148(23) | 4.40(1) h | β− | 129mTe | 7/2+ | ||||||||||||
129m1Sb | 1851.05(10) keV | 17.7(1) min | β− (85%) | 129Te | (19/2−) | ||||||||||||||
IT (15%) | 129Sb | ||||||||||||||||||
129m2Sb | 1860.90(10) keV | >2 μs | (15/2−) | ||||||||||||||||
129m3Sb | 2138.9(5) keV | 1.1(1) μs | (23/2+) | ||||||||||||||||
130Sb | 51 | 79 | 129.911656(18) | 39.5(8) min | β− | 130Te | (8−)# | ||||||||||||
130mSb | 4.80(20) keV | 6.3(2) min | β− | 130Te | (4, 5)+ | ||||||||||||||
131Sb | 51 | 80 | 130.911982(22) | 23.03(4) min | β− | 131mTe | (7/2+) | ||||||||||||
132Sb | 51 | 81 | 131.914467(15) | 2.79(5) min | β− | 132Te | (4+) | ||||||||||||
132m1Sb | 200(30) keV | 4.15(5) min | β− | 132Te | (8−) | ||||||||||||||
132m2Sb | 254.5(3) keV | 102(4) ns | (6−) | ||||||||||||||||
133Sb | 51 | 82 | 132.915252(27) | 2.5(1) min | β− | 133mTe | (7/2+) | ||||||||||||
134Sb | 51 | 83 | 133.92038(5) | 0.78(6) s | β− | 134Te | (0-) | ||||||||||||
134mSb | 80(110) keV | 10.07(5) s | β− (99.9%) | 134Te | (7−) | ||||||||||||||
β−, n (.091%) | 133Te | ||||||||||||||||||
135Sb | 51 | 84 | 134.92517(11) | 1.68(2) s | β− (82.4%) | 135Te | (7/2+) | ||||||||||||
β−, n (17.6%) | 134Te | ||||||||||||||||||
136Sb | 51 | 85 | 135.93035(32)# | 0.923(14) s | β− (83%) | 136Te | 1−# | ||||||||||||
β−, n (17%) | 135Te | ||||||||||||||||||
136mSb | 173(3) keV | 570(50) ns | 6−# | ||||||||||||||||
137Sb | 51 | 86 | 136.93531(43)# | 450(50) ms | β− | 137Te | 7/2+# | ||||||||||||
β−, n | 136Te | ||||||||||||||||||
138Sb | 51 | 87 | 137.94079(32)# | 500# ms [>300 ns] | β− | 138Te | 2−# | ||||||||||||
β−, n | 137Te | ||||||||||||||||||
139Sb | 51 | 88 | 138.94598(54)# | 300# ms [>300 ns] | β− | 139Te | 7/2+# | ||||||||||||
This table header & footer: |
EC: | Electron capture |
IT: | Isomeric transition |
n: | Neutron emission |
p: | Proton emission |
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