Antimon (51Sb) yang terbentuk secara alami terdiri dari dua isotop stabil, 121Sb dan 123Sb. Ada 35 isotop radioaktif buatan, yang paling lama berumur 125Sb, dengan waktu paruh 2,75856 tahun; 124Sb, dengan waktu paruh 60,2 hari; dan 126Sb, dengan waktu paruh 12,35 hari. Semua isotop lain memiliki waktu paruh kurang dari 4 hari, kebanyakan kurang dari satu jam. Unsur ini juga memiliki banyak isomer, yang berumur paling panjang adalah 120m1Sb dengan waktu paruh 5,76 hari.

Daftar isotop

|-
| 103Sb
| style="text-align:right" | 51
| style="text-align:right" | 52
| 102,93969(32)#
| 100# mdtk [>1,5 µdtk]
| β+
| 103Sn
| 5/2+#
|
|
|-
| rowspan=4|104Sb
| rowspan=4 style="text-align:right" | 51
| rowspan=4 style="text-align:right" | 53
| rowspan=4|103,93647(39)#
| rowspan=4|0,47(13) dtk[0,44(+15−11) dtk]
| β+ (86%)
| 104Sn
| rowspan=4|
| rowspan=4|
| rowspan=4|
|-
| p (7%)
| 103Sn
|-
| β+, p (7%)
| 103In
|-
| α (<1%)
| 100In
|-
| rowspan=3|105Sb
| rowspan=3 style="text-align:right" | 51
| rowspan=3 style="text-align:right" | 54
| rowspan=3|104,93149(11)
| rowspan=3|1,12(16) dtk
| β+ (99%)
| 105Sn
| rowspan=3|(5/2+)
| rowspan=3|
| rowspan=3|
|-
| p (1%)
| 104Sn
|-
| β+, p (<1%)
| 104In
|-
| 106Sb
| style="text-align:right" | 51
| style="text-align:right" | 55
| 105,92879(34)#
| 0,6(2) dtk
| β+
| 106Sn
| (4+)
|
|
|-
| style="text-indent:1em" | 106mSb
| colspan="3" style="text-indent:2em" | 1000(500)# keV
| 220(20) ndtk
|
|
|
|
|
|-
| 107Sb
| style="text-align:right" | 51
| style="text-align:right" | 56
| 106,92415(32)#
| 4,0(2) dtk
| β+
| 107Sn
| 5/2+#
|
|
|-
| rowspan=2|108Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 57
| rowspan=2|107,92216(22)#
| rowspan=2|7,4(3) dtk
| β+
| 108Sn
| rowspan=2|(4+)
| rowspan=2|
| rowspan=2|
|-
| β+, p (langka)
| 107In
|-
| 109Sb
| style="text-align:right" | 51
| style="text-align:right" | 58
| 108,918132(20)
| 17,3(5) dtk
| β+
| 109Sn
| 5/2+#
|
|
|-
| 110Sb
| style="text-align:right" | 51
| style="text-align:right" | 59
| 109,91675(22)#
| 23,0(4) dtk
| β+
| 110Sn
| (4+)
|
|
|-
| 111Sb
| style="text-align:right" | 51
| style="text-align:right" | 60
| 110,91316(3)
| 75(1) dtk
| β+
| 111Sn
| (5/2+)
|
|
|-
| 112Sb
| style="text-align:right" | 51
| style="text-align:right" | 61
| 111,912398(19)
| 51,4(10) dtk
| β+
| 112Sn
| 3+
|
|
|-
| 113Sb
| style="text-align:right" | 51
| style="text-align:right" | 62
| 112,909372(19)
| 6,67(7) mnt
| β+
| 113Sn
| 5/2+
|
|
|-
| 114Sb
| style="text-align:right" | 51
| style="text-align:right" | 63
| 113,90927(3)
| 3,49(3) mnt
| β+
| 114Sn
| (3+)
|
|
|-
| style="text-indent:1em" | 114mSb
| colspan="3" style="text-indent:2em" | 495,5(7) keV
| 219(12) µdtk
|
|
| (8−)
|
|
|-
| 115Sb
| style="text-align:right" | 51
| style="text-align:right" | 64
| 114,906598(17)
| 32,1(3) mnt
| β+
| 115Sn
| 5/2+
|
|
|-
| 116Sb
| style="text-align:right" | 51
| style="text-align:right" | 65
| 115,906794(6)
| 15,8(8) mnt
| β+
| 116Sn
| 3+
|
|
|-
| style="text-indent:1em" | 116m1Sb
| colspan="3" style="text-indent:2em" | 93,99(5) keV
| 194(4) ndtk
|
|
| 1+
|
|
|-
| style="text-indent:1em" | 116m2Sb
| colspan="3" style="text-indent:2em" | 380(40) keV
| 60,3(6) mnt
| β+
| 116Sn
| 8−
|
|
|-
| 117Sb
| style="text-align:right" | 51
| style="text-align:right" | 66
| 116,904836(10)
| 2,80(1) jam
| β+
| 117Sn
| 5/2+
|
|
|-
| 118Sb
| style="text-align:right" | 51
| style="text-align:right" | 67
| 117,905529(4)
| 3,6(1) mnt
| β+
| 118Sn
| 1+
|
|
|-
| style="text-indent:1em" | 118m1Sb
| colspan="3" style="text-indent:2em" | 50,814(21) keV
| 20,6(6) µdtk
|
|
| (3)+
|
|
|-
| style="text-indent:1em" | 118m2Sb
| colspan="3" style="text-indent:2em" | 250(6) keV
| 5,00(2) jam
| β+
| 118Sn
| 8−
|
|
|-
| 119Sb
| style="text-align:right" | 51
| style="text-align:right" | 68
| 118,903942(9)
| 38,19(22) jam
| EC
| 119Sn
| 5/2+
|
|
|-
| style="text-indent:1em" | 119m1Sb
| colspan="3" style="text-indent:2em" | 2553,6(3) keV
| 130(3) ndtk
|
|
| (19/2−)
|
|
|-
| style="text-indent:1em" | 119m2Sb
| colspan="3" style="text-indent:2em" | 2852(7) keV
| 850(90) mdtk
| IT
| 119Sb
| 27/2+#
|
|
|-
| 120Sb
| style="text-align:right" | 51
| style="text-align:right" | 69
| 119,905072(8)
| 15,89(4) mnt
| β+
| 120Sn
| 1+
|
|
|-
| style="text-indent:1em" | 120m1Sb
| colspan="3" style="text-indent:2em" | 0(100)# keV
| 5,76(2) hri
| β+
| 120Sn
| 8−
|
|
|-
| style="text-indent:1em" | 120m2Sb
| colspan="3" style="text-indent:2em" | 78,16(5) keV
| 246(2) ndtk
|
|
| (3+)
|
|
|-
| style="text-indent:1em" | 120m3Sb
| colspan="3" style="text-indent:2em" | 2328,3(6) keV
| 400(8) ndtk
|
|
| (6)
|
|
|-
| 121Sb
| style="text-align:right" | 51
| style="text-align:right" | 70
| 120,9038157(24)
| colspan=3 align=center|Stabil
| 5/2+
| 0,5721(5)
|
|-
| rowspan=2|122Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 71
| rowspan=2|121,9051737(24)
| rowspan=2|2,7238(2) hri
| β− (97,59%)
| 122Te
| rowspan=2|2−
| rowspan=2|
| rowspan=2|
|-
| β+ (2,41%)
| 122Sn
|-
| style="text-indent:1em" | 122m1Sb
| colspan="3" style="text-indent:2em" | 61,4131(5) keV
| 1,86(8) µdtk
|
|
| 3+
|
|
|-
| style="text-indent:1em" | 122m2Sb
| colspan="3" style="text-indent:2em" | 137,4726(8) keV
| 0,53(3) mdtk
|
|
| (5)+
|
|
|-
| style="text-indent:1em" | 122m3Sb
| colspan="3" style="text-indent:2em" | 163,5591(17) keV
| 4,191(3) mnt
| IT
| 122Sb
| (8)−
|
|
|-
| 123Sb
| style="text-align:right" | 51
| style="text-align:right" | 72
| 122,9042140(22)
| colspan=3 align=center|Stabil
| 7/2+
| 0,4279(5)
|
|-
| 124Sb
| style="text-align:right" | 51
| style="text-align:right" | 73
| 123,9059357(22)
| 60,20(3) hri
| β−
| 124Te
| 3−
|
|
|-
| rowspan=2 style="text-indent:1em" | 124m1Sb
| rowspan=2 colspan="3" style="text-indent:2em" | 10,8627(8) keV
| rowspan=2|93(5) dtk
| IT (75%)
| 124Sb
| rowspan=2|5+
| rowspan=2|
| rowspan=2|
|-
| β− (25%)
| 124Te
|-
| style="text-indent:1em" | 124m2Sb
| colspan="3" style="text-indent:2em" | 36,8440(14) keV
| 20,2(2) mnt
|
|
| (8)−
|
|
|-
| style="text-indent:1em" | 124m3Sb
| colspan="3" style="text-indent:2em" | 40,8038(7) keV
| 3,2(3) µdtk
|
|
| (3+, 4+)
|
|
|-
| 125Sb
| style="text-align:right" | 51
| style="text-align:right" | 74
| 124,9052538(28)
| 2,75856(25) thn
| β−
| 125mTe
| 7/2+
|
|
|-
| 126Sb
| style="text-align:right" | 51
| style="text-align:right" | 75
| 125,90725(3)
| 12,35(6) hri
| β−
| 126Te
| (8−)
|
|
|-
| rowspan=2 style="text-indent:1em" | 126m1Sb
| rowspan=2 colspan="3" style="text-indent:2em" | 17,7(3) keV
| rowspan=2|19,15(8) mnt
| β− (86%)
| 126Te
| rowspan=2|(5+)
| rowspan=2|
| rowspan=2|
|-
| IT (14%)
| 126Sb
|-
| style="text-indent:1em" | 126m2Sb
| colspan="3" style="text-indent:2em" | 40,4(3) keV
| ~11 dtk
| IT
| 126m1Sb
| (3−)
|
|
|-
| style="text-indent:1em" | 126m3Sb
| colspan="3" style="text-indent:2em" | 104,6(3) keV
| 553(5) ndtk
|
|
| (3+)
|
|
|-
| 127Sb
| style="text-align:right" | 51
| style="text-align:right" | 76
| 126,906924(6)
| 3,85(5) hri
| β−
| 127mTe
| 7/2+
|
|
|-
| 128Sb
| style="text-align:right" | 51
| style="text-align:right" | 77
| 127,909169(27)
| 9,01(4) jam
| β−
| 128Te
| 8−
|
|
|-
| rowspan=2 style="text-indent:1em" | 128mSb
| rowspan=2 colspan="3" style="text-indent:2em" | 10(7) keV
| rowspan=2|10,4(2) mnt
| β− (96,4%)
| 128Te
| rowspan=2|5+
| rowspan=2|
| rowspan=2|
|-
| IT (3,6%)
| 128Sb
|-
| 129Sb
| style="text-align:right" | 51
| style="text-align:right" | 78
| 128,909148(23)
| 4,40(1) jam
| β−
| 129mTe
| 7/2+
|
|
|-
| rowspan=2 style="text-indent:1em" | 129m1Sb
| rowspan=2 colspan="3" style="text-indent:2em" | 1851,05(10) keV
| rowspan=2|17,7(1) mnt
| β− (85%)
| 129Te
| rowspan=2|(19/2−)
| rowspan=2|
| rowspan=2|
|-
| IT (15%)
| 129Sb
|-
| style="text-indent:1em" | 129m2Sb
| colspan="3" style="text-indent:2em" | 1860,90(10) keV
| >2 µdtk
|
|
| (15/2−)
|
|
|-
| style="text-indent:1em" | 129m3Sb
| colspan="3" style="text-indent:2em" | 2138,9(5) keV
| 1,1(1) µdtk
|
|
| (23/2+)
|
|
|-
| 130Sb
| style="text-align:right" | 51
| style="text-align:right" | 79
| 129,911656(18)
| 39,5(8) mnt
| β−
| 130Te
| (8−)#
|
|
|-
| style="text-indent:1em" | 130mSb
| colspan="3" style="text-indent:2em" | 4,80(20) keV
| 6,3(2) mnt
| β−
| 130Te
| (4, 5)+
|
|
|-
| 131Sb
| style="text-align:right" | 51
| style="text-align:right" | 80
| 130,911982(22)
| 23,03(4) mnt
| β−
| 131mTe
| (7/2+)
|
|
|-
| 132Sb
| style="text-align:right" | 51
| style="text-align:right" | 81
| 131,914467(15)
| 2,79(5) mnt
| β−
| 132Te
| (4+)
|
|
|-
| style="text-indent:1em" | 132m1Sb
| colspan="3" style="text-indent:2em" | 200(30) keV
| 4,15(5) mnt
| β−
| 132Te
| (8−)
|
|
|-
| style="text-indent:1em" | 132m2Sb
| colspan="3" style="text-indent:2em" | 254,5(3) keV
| 102(4) ndtk
|
|
| (6−)
|
|
|-
| 133Sb
| style="text-align:right" | 51
| style="text-align:right" | 82
| 132,915252(27)
| 2,5(1) mnt
| β−
| 133mTe
| (7/2+)
|
|
|-
| 134Sb
| style="text-align:right" | 51
| style="text-align:right" | 83
| 133,92038(5)
| 0,78(6) dtk
| β−
| 134Te
| (0-)
|
|
|-
| rowspan=2 style="text-indent:1em" | 134mSb
| rowspan=2 colspan="3" style="text-indent:2em" | 80(110) keV
| rowspan=2|10,07(5) dtk
| β− (99,9%)
| 134Te
| rowspan=2|(7−)
| rowspan=2|
| rowspan=2|
|-
| β−, n (0,091%)
| 133Te
|-
| rowspan=2|135Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 84
| rowspan=2|134,92517(11)
| rowspan=2|1,68(2) dtk
| β− (82,4%)
| 135Te
| rowspan=2|(7/2+)
| rowspan=2|
| rowspan=2|
|-
| β−, n (17,6%)
| 134Te
|-
| rowspan=2|136Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 85
| rowspan=2|135,93035(32)#
| rowspan=2|0,923(14) dtk
| β− (83%)
| 136Te
| rowspan=2|1−#
| rowspan=2|
| rowspan=2|
|-
| β−, n (17%)
| 135Te
|-
| style="text-indent:1em" | 136mSb
| colspan="3" style="text-indent:2em" | 173(3) keV
| 570(50) ndtk
|
|
| 6−#
|
|
|-
| rowspan=2|137Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 86
| rowspan=2|136,93531(43)#
| rowspan=2|450(50) mdtk
| β−
| 137Te
| rowspan=2|7/2+#
| rowspan=2|
| rowspan=2|
|-
| β−, n
| 136Te
|-
| rowspan=2|138Sb
| rowspan=2 style="text-align:right" | 51
| rowspan=2 style="text-align:right" | 87
| rowspan=2|137,94079(32)#
| rowspan=2|500# mdtk [>300 ndtk]
| β−
| 138Te
| rowspan=2|2−#
| rowspan=2|
| rowspan=2|
|-
| β−, n
| 137Te
|-
| 139Sb
| style="text-align:right" | 51
| style="text-align:right" | 88
| 138,94598(54)#
| 300# mdtk [>300 ndtk]
| β−
| 139Te
| 7/2+#
|
|

Referensi

 Massa isotop dari:

 Komposisi isotop dan massa atom standar dari:

 Data waktu paruh, spin, dan isomer dipilih dari sumber-sumber berikut.

Isotop antimon
Antimon
Antimon