Isotopes of antimony

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Isotopes of antimony  (51Sb)
Main isotopes [1] Decay
abun­dance half-life (t1/2) mode pro­duct
121Sb57.2% stable
123Sb42.8%stable
125Sb synth 2.7576 y β− 125Te
Standard atomic weight Ar°(Sb)
  • 121.760±0.001
  • 121.76±0.01 (abridged) [2] [3]

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.

Contents

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.

List of isotopes

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 proportionRange of variation
103Sb5152102.93969(32)#100# ms [>1.5 µs] β+ 103Sn5/2+#
104Sb5153103.93647(39)#0.47(13) s
[0.44(+15−11) s]		β+ (86%)104Sn
p (7%)103Sn
β+, p (7%)103In
α (<1%)100In
105Sb5154104.93149(11)1.12(16) sβ+ (99%)105Sn(5/2+)
p (1%)104Sn
β+, p (<1%)104In
106Sb5155105.92879(34)#0.6(2) sβ+106Sn(4+)
106mSb1000(500)# keV220(20) ns
107Sb5156106.92415(32)#4.0(2) sβ+107Sn5/2+#
108Sb5157107.92216(22)#7.4(3) sβ+108Sn(4+)
β+, p (rare)107In
109Sb5158108.918132(20)17.3(5) sβ+109Sn5/2+#
110Sb5159109.91675(22)#23.0(4) sβ+110Sn(4+)
111Sb5160110.91316(3)75(1) sβ+111Sn(5/2+)
112Sb5161111.912398(19)51.4(10) sβ+112Sn3+
113Sb5162112.909372(19)6.67(7) minβ+113Sn5/2+
114Sb5163113.90927(3)3.49(3) minβ+114Sn(3+)
114mSb495.5(7) keV219(12) µs(8−)
115Sb5164114.906598(17)32.1(3) minβ+115Sn5/2+
116Sb5165115.906794(6)15.8(8) minβ+116Sn3+
116m1Sb93.99(5) keV194(4) ns1+
116m2Sb380(40) keV60.3(6) minβ+116Sn8−
117Sb5166116.904836(10)2.80(1) hβ+117Sn5/2+
118Sb5167117.905529(4)3.6(1) minβ+118Sn1+
118m1Sb50.814(21) keV20.6(6) µs(3)+
118m2Sb250(6) keV5.00(2) hβ+118Sn8−
119Sb5168118.903942(9)38.19(22) h EC 119Sn5/2+
119m1Sb2553.6(3) keV130(3) ns(19/2−)
119m2Sb2852(7) keV850(90) ms IT 119Sb27/2+#
120Sb5169119.905072(8)15.89(4) minβ+120Sn1+
120m1Sb0(100)# keV5.76(2) dβ+120Sn8−
120m2Sb78.16(5) keV246(2) ns(3+)
120m3Sb2328.3(6) keV400(8) ns(6)
121Sb [n 9] 5170120.9038157(24)Stable [n 10] 5/2+0.5721(5)
122Sb5171121.9051737(24)2.7238(2) dβ− (97.59%)122Te2−
β+ (2.41%)122Sn
122m1Sb61.4131(5) keV1.86(8) µs3+
122m2Sb137.4726(8) keV0.53(3) ms(5)+
122m3Sb163.5591(17) keV4.191(3) minIT122Sb(8)−
123Sb [n 9] 5172122.9042140(22)Stable [n 10] 7/2+0.4279(5)
124Sb5173123.9059357(22)60.20(3) dβ−124Te3−
124m1Sb10.8627(8) keV93(5) sIT (75%)124Sb5+
β− (25%)124Te
124m2Sb36.8440(14) keV20.2(2) min(8)−
124m3Sb40.8038(7) keV3.2(3) µs(3+, 4+)
125Sb5174124.9052538(28)2.75856(25) yβ−125mTe7/2+
126Sb5175125.90725(3)12.35(6) dβ−126Te(8−)
126m1Sb17.7(3) keV19.15(8) minβ− (86%)126Te(5+)
IT (14%)126Sb
126m2Sb40.4(3) keV~11 sIT126m1Sb(3−)
126m3Sb104.6(3) keV553(5) ns(3+)
127Sb5176126.906924(6)3.85(5) dβ−127mTe7/2+
128Sb5177127.909169(27)9.01(4) hβ−128Te8−
128mSb10(7) keV10.4(2) minβ− (96.4%)128Te5+
IT (3.6%)128Sb
129Sb5178128.909148(23)4.40(1) hβ−129mTe7/2+
129m1Sb1851.05(10) keV17.7(1) minβ− (85%)129Te(19/2−)
IT (15%)129Sb
129m2Sb1860.90(10) keV>2 µs(15/2−)
129m3Sb2138.9(5) keV1.1(1) µs(23/2+)
130Sb5179129.911656(18)39.5(8) minβ−130Te(8−)#
130mSb4.80(20) keV6.3(2) minβ−130Te(4, 5)+
131Sb5180130.911982(22)23.03(4) minβ−131mTe(7/2+)
132Sb5181131.914467(15)2.79(5) minβ−132Te(4+)
132m1Sb200(30) keV4.15(5) minβ−132Te(8−)
132m2Sb254.5(3) keV102(4) ns(6−)
133Sb5182132.915252(27)2.5(1) minβ−133mTe(7/2+)
134Sb5183133.92038(5)0.78(6) sβ−134Te(0-)
134mSb80(110) keV10.07(5) sβ− (99.9%)134Te(7−)
β−, n (.091%)133Te
135Sb5184134.92517(11)1.68(2) sβ− (82.4%)135Te(7/2+)
β−, n (17.6%)134Te
136Sb5185135.93035(32)#0.923(14) sβ− (83%)136Te1−#
β−, n (17%)135Te
136mSb173(3) keV570(50) ns6−#
137Sb5186136.93531(43)#450(50) msβ−137Te7/2+#
β−, n136Te
138Sb5187137.94079(32)#500# ms [>300 ns]β−138Te2−#
β−, n137Te
139Sb5188138.94598(54)#300# ms [>300 ns]β−139Te7/2+#
This table header & footer:
  1. ↑ mSb – Excited nuclear isomer.
  2. ↑ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. ↑ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. ↑ Modes of decay:
    EC: Electron capture
    IT: Isomeric transition
    n: Neutron emission
    p: Proton emission
  5. ↑ Bold italics symbol as daughter – Daughter product is nearly stable.
  6. ↑ Bold symbol as daughter – Daughter product is stable.
  7. ↑ ( ) spin value – Indicates spin with weak assignment arguments.
  8. 1 2 # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  9. 1 2 Fission product
  10. 1 2 Theoretically capable of spontaneous fission

See also

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<span class="mw-page-title-main">Isotopes of lanthanum</span> Nuclides with atomic number of 57 but with different mass numbers

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References

  1. ↑ 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.
  2. ↑ "Standard Atomic Weights: Antimony". CIAAW. 1993.
  3. ↑ 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.
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