砷的同位素
圖表

| 符號 | Z> 激發能量 | N> 激發能量 | 同位素質量（u） > 激發能量 | 半衰期 | 衰變方式 | 衰變產物 | 原子核 自旋 | 相對豐度 （莫耳分率） |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 60As | 33 | 27 | 59.99313(64)# |  | p | 59Ge | 5+# |  |
| 61As | 33 | 28 | 60.98062(64)# |  | p | 60Ge | 3/2-# |  |
| 62As | 33 | 29 | 61.97320(32)# |  | p | 61Ge | 1+# |  |
| 63As | 33 | 30 | 62.96369(54)# |  | p | 62Ge | (3/2-)# |  |
| 64As | 33 | 31 | 63.95757(38)# | 40(30) ms [18(+43-7) ms] | β+ | 64Ge | 0+# |  |
| 65As | 33 | 32 | 64.94956(32)# | 170(30) ms | β+ | 65Ge | 3/2-# |  |
| 66As | 33 | 33 | 65.94471(73) | 95.77(23) ms | β+ | 66Ge | (0+) |  |
| 66m1As | 1356.70(17) keV | 1356.70(17) keV | 1356.70(17) keV | 1.1(1) µs |  |  | (5+) |  |
| 66m2As | 3023.9(3) keV | 3023.9(3) keV | 3023.9(3) keV | 8.2(5) µs |  |  | (9+) |  |
| 67As | 33 | 34 | 66.93919(11) | 42.5(12) s | β+ | 67Ge | (5/2-) |  |
| 68As | 33 | 35 | 67.93677(5) | 151.6(8) s | β+ | 68Ge | 3+ |  |
| 68mAs | 425.21(16) keV | 425.21(16) keV | 425.21(16) keV | 111(20) ns [?107(+23-16) ns] |  |  | 1+ |  |
| 69As | 33 | 36 | 68.93227(3) | 15.2(2) min | β+ | 69Ge | 5/2- |  |
| 70As | 33 | 37 | 69.93092(5) | 52.6(3) min | β+ | 70Ge | 4(+#) |  |
| 70mAs | 32.008(23) keV | 32.008(23) keV | 32.008(23) keV | 96(3) µs |  |  | 2(+) |  |
| 71As | 33 | 38 | 70.927112(5) | 65.28(15) h | β+ | 71Ge | 5/2- |  |
| 72As | 33 | 39 | 71.926752(5) | 26.0(1) h | β+ | 72Ge | 2- |  |
| 73As | 33 | 40 | 72.923825(4) | 80.30(6) d | ε | 73Ge | 3/2- |  |
| 74As | 33 | 41 | 73.9239287(25) | 17.77(2) d | β+ (66%) | 74Ge | 2- |  |
| 74As | 33 | 41 | 73.9239287(25) | 17.77(2) d | β− (34%) | 74Se | 2- |  |
| 75As | 33 | 42 | 74.9215965(20) | 稳定 | 稳定 | 稳定 | 3/2- | 1.0000 |
| 75mAs | 303.9241(7) keV | 303.9241(7) keV | 303.9241(7) keV | 17.62(23) ms |  |  | 9/2+ |  |
| 76As | 33 | 43 | 75.922394(2) | 1.0942(7) d | β− (99.98%) | 76Se | 2- |  |
| 76As | 33 | 43 | 75.922394(2) | 1.0942(7) d | ε (.02%) | 76Ge | 2- |  |
| 76mAs | 44.425(1) keV | 44.425(1) keV | 44.425(1) keV | 1.84(6) µs |  |  | (1)+ |  |
| 77As | 33 | 44 | 76.9206473(25) | 38.83(5) h | β− | 77mSe | 3/2- |  |
| 77mAs | 475.443(16) keV | 475.443(16) keV | 475.443(16) keV | 114.0(25) µs |  |  | 9/2+ |  |
| 78As | 33 | 45 | 77.921827(11) | 90.7(2) min | β− | 78Se | 2- |  |
| 79As | 33 | 46 | 78.920948(6) | 9.01(15) min | β− | 79mSe | 3/2- |  |
| 79mAs | 772.81(6) keV | 772.81(6) keV | 772.81(6) keV | 1.21(1) µs |  |  | (9/2)+ |  |
| 80As | 33 | 47 | 79.922534(25) | 15.2(2) s | β− | 80Se | 1+ |  |
| 81As | 33 | 48 | 80.922132(6) | 33.3(8) s | β− | 81mSe | 3/2- |  |
| 82As | 33 | 49 | 81.92450(21) | 19.1(5) s | β− | 82Se | (1+) |  |
| 82mAs | 250(200) keV | 250(200) keV | 250(200) keV | 13.6(4) s | β− | 82Se | (5-) |  |
| 83As | 33 | 50 | 82.92498(24) | 13.4(3) s | β− | 83mSe | 3/2-# |  |
| 84As | 33 | 51 | 83.92906(32)# | 4.02(3) s | β− (99.721%) | 84Se | (3)(+#) |  |
| 84As | 33 | 51 | 83.92906(32)# | 4.02(3) s | β−, n (.029%) | 83Se | (3)(+#) |  |
| 84mAs | 0(100)# keV | 0(100)# keV | 0(100)# keV | 650(150) ms |  |  |  |  |
| 85As | 33 | 52 | 84.93202(21)# | 2.021(10) s | β−, n (59.4%) | 84Se | (3/2-)# |  |
| 85As | 33 | 52 | 84.93202(21)# | 2.021(10) s | β− (40.6%) | 85Se | (3/2-)# |  |
| 86As | 33 | 53 | 85.93650(32)# | 0.945(8) s | β− (67%) | 86Se |  |  |
| 86As | 33 | 53 | 85.93650(32)# | 0.945(8) s | β−, n (33%) | 85Se |  |  |
| 87As | 33 | 54 | 86.93990(32)# | 0.56(8) s | β− (84.6%) | 87Se | 3/2-# |  |
| 87As | 33 | 54 | 86.93990(32)# | 0.56(8) s | β−, n (15.4%) | 86Se | 3/2-# |  |
| 88As | 33 | 55 | 87.94494(54)# | 300# ms [>300 ns] | β− | 88Se |  |  |
| 88As | 33 | 55 | 87.94494(54)# | 300# ms [>300 ns] | β−, n | 87Se |  |  |
| 89As | 33 | 56 | 88.94939(54)# | 200# ms [>300 ns] | β− | 89Se | 3/2-# |  |
| 90As | 33 | 57 | 89.95550(86)# | 80# ms [>300 ns] |  |  |  |  |
| 91As | 33 | 58 | 90.96043(97)# | 50# ms [>300 ns] |  |  | 3/2-# |  |
| 92As | 33 | 59 | 91.96680(97)# | 30# ms [>300 ns] |  |  |  |  |
1 2 3 4  畫上#號的數據代表沒有經過實驗的証明，僅為理論推測。
1 2 3  用括號括起來的數據代表不確定性。
↑  穩定的衰變產物以粗體表示。
↑  半衰期超过5亿年的衰变产物以粗斜体表示。
| 0 | 1 | 2 |
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