Isotopes of Antimony
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Isotopes of Antimony
Main isotopes of antimony (51Sb)
Iso­tope Decay
abun­dance half-life (t1/2) mode pro­duct
121Sb 57.21% stable
123Sb 42.79% stable
125Sb syn 2.7582 y ?- 125Te
Standard atomic weight Ar, standard(Sb)

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.

List of isotopes

Nuclide
[n 1]
Z N Isotopic mass (u)
[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] ?+ 103Sn 5/2+#
104Sb 51 53 103.93647(39)# 0.47(13) s
[0.44(+15-11) s]
?+ (86%) 104Sn
p (7%) 103Sn
?+, p (7%) 103In
? (<1%) 100In
105Sb 51 54 104.93149(11) 1.12(16) s ?+ (99%) 105Sn (5/2+)
p (1%) 104Sn
?+, p (<1%) 104In
106Sb 51 55 105.92879(34)# 0.6(2) s ?+ 106Sn (4+)
106mSb 1000(500)# keV 220(20) ns
107Sb 51 56 106.92415(32)# 4.0(2) s ?+ 107Sn 5/2+#
108Sb 51 57 107.92216(22)# 7.4(3) s ?+ 108Sn (4+)
?+, p (rare) 107In
109Sb 51 58 108.918132(20) 17.3(5) s ?+ 109Sn 5/2+#
110Sb 51 59 109.91675(22)# 23.0(4) s ?+ 110Sn (4+)
111Sb 51 60 110.91316(3) 75(1) s ?+ 111Sn (5/2+)
112Sb 51 61 111.912398(19) 51.4(10) s ?+ 112Sn 3+
113Sb 51 62 112.909372(19) 6.67(7) min ?+ 113Sn 5/2+
114Sb 51 63 113.90927(3) 3.49(3) min ?+ 114Sn (3+)
114mSb 495.5(7) keV 219(12) µs (8-)
115Sb 51 64 114.906598(17) 32.1(3) min ?+ 115Sn 5/2+
116Sb 51 65 115.906794(6) 15.8(8) min ?+ 116Sn 3+
116m1Sb 93.99(5) keV 194(4) ns 1+
116m2Sb 380(40) keV 60.3(6) min ?+ 116Sn 8-
117Sb 51 66 116.904836(10) 2.80(1) h ?+ 117Sn 5/2+
118Sb 51 67 117.905529(4) 3.6(1) min ?+ 118Sn 1+
118m1Sb 50.814(21) keV 20.6(6) µs (3)+
118m2Sb 250(6) keV 5.00(2) h ?+ 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 ?+ 120Sn 1+
120m1Sb 0(100)# keV 5.76(2) d ?+ 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 ?- (97.59%) 122Te 2-
?+ (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 ?- 124Te 3-
124m1Sb 10.8627(8) keV 93(5) s IT (75%) 124Sb 5+
?- (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 ?- 125mTe 7/2+
126Sb 51 75 125.90725(3) 12.35(6) d ?- 126Te (8-)
126m1Sb 17.7(3) keV 19.15(8) min ?- (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 ?- 127mTe 7/2+
128Sb 51 77 127.909169(27) 9.01(4) h ?- 128Te 8-
128mSb 10(7) keV 10.4(2) min ?- (96.4%) 128Te 5+
IT (3.6%) 128Sb
129Sb 51 78 128.909148(23) 4.40(1) h ?- 129mTe 7/2+
129m1Sb 1851.05(10) keV 17.7(1) min ?- (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 ?- 130Te (8-)#
130mSb 4.80(20) keV 6.3(2) min ?- 130Te (4, 5)+
131Sb 51 80 130.911982(22) 23.03(4) min ?- 131mTe (7/2+)
132Sb 51 81 131.914467(15) 2.79(5) min ?- 132Te (4+)
132m1Sb 200(30) keV 4.15(5) min ?- 132Te (8-)
132m2Sb 254.5(3) keV 102(4) ns (6-)
133Sb 51 82 132.915252(27) 2.5(1) min ?- 133mTe (7/2+)
134Sb 51 83 133.92038(5) 0.78(6) s ?- 134Te (0-)
134mSb 80(110) keV 10.07(5) s ?- (99.9%) 134Te (7-)
?-, n (.091%) 133Te
135Sb 51 84 134.92517(11) 1.68(2) s ?- (82.4%) 135Te (7/2+)
?-, n (17.6%) 134Te
136Sb 51 85 135.93035(32)# 0.923(14) s ?- (83%) 136Te 1-#
?-, n (17%) 135Te
136mSb 173(3) keV 570(50) ns 6-#
137Sb 51 86 136.93531(43)# 450(50) ms ?- 137Te 7/2+#
?-, n 136Te
138Sb 51 87 137.94079(32)# 500# ms [>300 ns] ?- 138Te 2-#
?-, n 137Te
139Sb 51 88 138.94598(54)# 300# ms [>300 ns] ?- 139Te 7/2+#
  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:
  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. ^ a b # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  9. ^ a b Fission product

See also

References

  1. ^ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265-91. doi:10.1515/pac-2015-0305.

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