Isotopes of antimony

Isotopes of antimony (₅₁Sb)
Standard atomic weight Ar°(Sb)
	121.760±0.001; 121.76±0.01 (abridged);
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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 symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)^[4]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
nuclide symbol	excitation energy			half-life	decay mode(s)^[4]^{[n 1]}	daughter isotope(s)^{[n 2]}	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
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+)
¹⁰⁸Sb	51	57	107.92216(22)#	7.4(3) s	β⁺, p (rare)	¹⁰⁷In	(4+)
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−
¹²²Sb	51	71	121.9051737(24)	2.7238(2) d	β⁺ (2.41%)	¹²²Sn	2−
^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+
^124m1Sb	10.8627(8) keV			93(5) s	β⁻ (25%)	¹²⁴Te	5+
^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+)
^126m1Sb	17.7(3) keV			19.15(8) min	IT (14%)	¹²⁶Sb	(5+)
^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+
^128mSb	10(7) keV			10.4(2) min	IT (3.6%)	¹²⁸Sb	5+
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−)
^129m1Sb	1851.05(10) keV			17.7(1) min	IT (15%)	¹²⁹Sb	(19/2−)
^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−)
^134mSb	80(110) keV			10.07(5) s	β⁻, n (.091%)	¹³³Te	(7−)
¹³⁵Sb	51	84	134.92517(11)	1.68(2) s	β⁻ (82.4%)	¹³⁵Te	(7/2+)
¹³⁵Sb	51	84	134.92517(11)	1.68(2) s	β⁻, n (17.6%)	¹³⁴Te	(7/2+)
¹³⁶Sb	51	85	135.93035(32)#	0.923(14) s	β⁻ (83%)	¹³⁶Te	1−#
¹³⁶Sb	51	85	135.93035(32)#	0.923(14) s	β⁻, n (17%)	¹³⁵Te	1−#
^136mSb	173(3) keV			570(50) ns			6−#
¹³⁷Sb	51	86	136.93531(43)#	450(50) ms	β⁻	¹³⁷Te	7/2+#
¹³⁷Sb	51	86	136.93531(43)#	450(50) ms	β⁻, n	¹³⁶Te	7/2+#
¹³⁸Sb	51	87	137.94079(32)#	500# ms [>300 ns]	β⁻	¹³⁸Te	2−#
¹³⁸Sb	51	87	137.94079(32)#	500# ms [>300 ns]	β⁻, n	¹³⁷Te	2−#
¹³⁹Sb	51	88	138.94598(54)#	300# ms [>300 ns]	β⁻	¹³⁹Te	7/2+#

^ Abbreviations:
EC: Electron capture
IT: Isomeric transition
^ Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
^ ^a ^b Fission product
^ ^a ^b 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.

References

^ 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.
^ "Standard Atomic Weights: Antimony". CIAAW. 1993.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (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.
^ "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

Isotope masses from:
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
Isotopic compositions and standard atomic masses from:
- J. R. de Laeter; J. K. Böhlke; P. De Bièvre; H. Hidaka; H. S. Peiser; K. J. R. Rosman; P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. {{cite journal}}: Unknown parameter |laysummary= ignored (help)
Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
- G. Audi; A. H. Wapstra; C. Thibault; J. Blachot; O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. Bibcode:2003NuPhA.729....3A. doi:10.1016/j.nuclphysa.2003.11.001. Archived from the original (PDF) on 2008-09-23. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
- National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. {{cite web}}: Check date values in: |accessdate= (help)
- N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)

[5] Abbreviations:
EC: Electron capture
IT: Isomeric transition

[6] Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)

[FP-7] Fission product

[SF-8] Theoretically capable of spontaneous fission

[NUBASE2020-1] 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.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (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.

[4] "Universal Nuclide Chart". nucleonica. {{cite web}}: Unknown parameter |registration= ignored (|url-access= suggested) (help)

[1]

[2]

[3]

[4]

[n 1]

[n 2]

[n 3]

[n 4]

List of isotopes

Notes

See also

References