Isotopes of antimony

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Antimony (Sb) 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.

Relative atomic mass: 121.760(1).

Table

nuclide
symbol		 Z(p) N(n)  
isotopic mass (u)
 		 half-life decay
mode(s)[1][n 1]		 daughter
isotope(s)[n 2]		 nuclear
spin		 representative
isotopic
composition
(mole fraction)		 range of natural
variation
(mole fraction)
excitation energy
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 3] 51 70 120.9038157(24) Stable[n 4] 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 3] 51 72 122.9042140(22) Stable[n 4] 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+#
  1. ↑ Abbreviations:
    EC: Electron capture
    IT: Isomeric transition
  2. ↑ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
  3. ↑ 3.0 3.1 Fission product
  4. ↑ 4.0 4.1 Theoretically capable of spontaneous fission

Notes

  • Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

See also

References

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  • Isotope masses from:
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  • Isotopic compositions and standard atomic masses from:
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  • Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
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Isotopes of tin Isotopes of antimony Isotopes of tellurium
Table of nuclides
Isotopes of the chemical elements
1
H		 2
He
3
Li		 4
Be		 5
B		 6
C		 7
N		 8
O		 9
F		 10
Ne
11
Na		 12
Mg		 13
Al		 14
Si		 15
P		 16
S		 17
Cl		 18
Ar
19
K		 20
Ca		 21
Sc		 22
Ti		 23
V		 24
Cr		 25
Mn		 26
Fe		 27
Co		 28
Ni		 29
Cu		 30
Zn		 31
Ga		 32
Ge		 33
As		 34
Se		 35
Br		 36
Kr
37
Rb		 38
Sr		 39
Y		 40
Zr		 41
Nb		 42
Mo		 43
Tc		 44
Ru		 45
Rh		 46
Pd		 47
Ag		 48
Cd		 49
In		 50
Sn		 51
Sb		 52
Te		 53
I		 54
Xe
55
Cs		 56
Ba		 1 asterisk 72
Hf		 73
Ta		 74
W		 75
Re		 76
Os		 77
Ir		 78
Pt		 79
Au		 80
Hg		 81
Tl		 82
Pb		 83
Bi		 84
Po		 85
At		 86
Rn
87
Fr		 88
Ra		 2 asterisks 104
Rf		 105
Db		 106
Sg		 107
Bh		 108
Hs		 109
Mt		 110
Ds		 111
Rg		 112
Cn		 113
Uut		 114
Fl		 115
Uup		 116
Lv		 117
Uus		 118
Uuo
1 asterisk 57
La		 58
Ce		 59
Pr		 60
Nd		 61
Pm		 62
Sm		 63
Eu		 64
Gd		 65
Tb		 66
Dy		 67
Ho		 68
Er		 69
Tm		 70
Yb		 71
Lu
2 asterisks 89
Ac		 90
Th		 91
Pa		 92
U		 93
Np		 94
Pu		 95
Am		 96
Cm		 97
Bk		 98
Cf		 99
Es		 100
Fm		 101
Md		 102
No		 103
Lr
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