As
Arsenic
Z 33 74.922 g/molMetalloid
| 75As | 42 | 74.9216 | -73,034.2 | 100.0% | Stable | 3/2- | --- | 1920 |
| 60As | 27 | 59.9939 | -5,640.0 | --- | --- | (5+) | p→59Ge | --- |
| 60mAs | 27 | 59.994 | -5,580.0 | --- | --- | (2+) | p→59Ge | --- |
| 61As | 28 | 60.9815 | -17,200.0 | --- | --- | (3/2-) | p→60Ge | --- |
| 62As | 29 | 61.9738 | -24,420.0 | --- | --- | (1+) | p→61Ge | --- |
| 63As | 30 | 62.964 | -33,500.0 | --- | --- | (3/2-) | p→62Ge | --- |
| 64As | 31 | 63.9576 | -39,530.0 | --- | 69.0 ms | (0+) | β⁺→64Ge(100%) β⁺p→63Ga | 1995 |
| 65As | 32 | 64.9496 | -46,940.0 | --- | 130.3 ms | (3/2-) | β⁺→65Ge(100%) β⁺p→64Ga | 1991 |
| 66As | 33 | 65.9441 | -52,025.0 | --- | 95.77 ms | 0+ | β⁺→66Ge(100%) | 1978 |
| 66mAs | 33 | 65.9456 | -50,668.0 | --- | 1.14 µs | 5+ | γ→66As(100%) | 1995 |
| 66nAs | 33 | 65.9474 | -49,001.0 | --- | 7.98 µs | 9+ | γ→66As(100%) | 1998 |
| 67As | 34 | 66.9393 | -56,587.2 | --- | 42.5 s | (5/2-) | β⁺→67Ge(100%) | 1980 |
| 68As | 35 | 67.9368 | -58,894.5 | --- | 2.53 m | 3+ | β⁺→68Ge(100%) | 1971 |
| 68mAs | 35 | 67.9372 | -58,469.4 | --- | 111.0 ns | 1+ | γ→68As(100%) | 1994 |
| 69As | 36 | 68.9322 | -63,110.0 | --- | 15.2 m | 5/2- | β⁺→69Ge(100%) | 1955 |
| 70As | 37 | 69.9309 | -64,334.0 | --- | 52.6 m | 4+ | β⁺→70Ge(100%) | 1950 |
| 70mAs | 37 | 69.931 | -64,302.0 | --- | 96.0 µs | 2+ | γ→70As(100%) | 1979 |
| 71As | 38 | 70.9271 | -67,893.0 | --- | 2.72 d | 5/2- | β⁺→71Ge(100%) | 1939 |
| 72As | 39 | 71.9268 | -68,230.0 | --- | 1.08 d | 2- | β⁺→72Ge(100%) | 1939 |
| 73As | 40 | 72.9238 | -70,953.0 | --- | 80.3 d | 3/2- | EC→73Ge(100%) | 1948 |
| 73mAs | 40 | 72.9243 | -70,525.0 | --- | 5.7 µs | 9/2+ | γ→73As(100%) | 1956 |
| 74As | 41 | 73.9239 | -70,860.1 | --- | 17.77 d | 2- | β⁺→74Ge(66%) β⁻→74Se(34%) | 1938 |
| 75mAs | 42 | 74.9219 | -72,730.3 | --- | 17.62 ms | 9/2+ | γ→75As(100%) | 1957 |
| 76As | 43 | 75.9224 | -72,291.4 | --- | 1.09 d | 2- | β⁻→76Se(100%) | 1934 |
| 76mAs | 43 | 75.9224 | -72,247.0 | --- | 1.84 µs | (1+) | γ→76As(100%) | 1966 |
| 77As | 44 | 76.9206 | -73,916.3 | --- | 1.62 d | 3/2- | β⁻→77Se(100%) | 1951 |
| 77mAs | 44 | 76.9212 | -73,440.8 | --- | 114.0 µs | 9/2+ | γ→77As(100%) | 1957 |
| 78As | 45 | 77.9218 | -72,817.0 | --- | 1.51 h | 2- | β⁻→78Se(100%) | 1937 |
| 79As | 46 | 78.9209 | -73,636.0 | --- | 9.01 m | 3/2- | β⁻→79Se(100%) | 1950 |
| 79mAs | 46 | 78.9218 | -72,863.0 | --- | 1.21 µs | (9/2+) | γ→79As(100%) | 1998 |
| 80As | 47 | 79.9225 | -72,215.0 | --- | 15.2 s | 1+ | β⁻→80Se(100%) | 1954 |
| 81As | 48 | 80.9221 | -72,533.3 | --- | 33.3 s | 3/2- | β⁻→81Se(100%) | 1960 |
| 82As | 49 | 81.9247 | -70,105.0 | --- | 19.1 s | (2-) | β⁻→82Se(100%) | 1968 |
| 82mAs | 49 | 81.9249 | -69,973.0 | --- | 13.6 s | (5-) | β⁻→82Se(100%) | 1970 |
| 83As | 50 | 82.9252 | -69,669.3 | --- | 13.4 s | (5/2-) | β⁻→83Se(100%) | 1968 |
| 84As | 51 | 83.9293 | -65,854.0 | --- | 3.16 s | (2-) | β⁻→84Se(99.72%) β⁻n→83Se(0.28%) | 1968 |
| 84mAs | 51 | 84.0 | 0.0 | --- | 650.0 ms | --- | β⁻→84Se(100%) | 1974 |
| 85As | 52 | 84.9322 | -63,189.0 | --- | 2.02 s | (5/2-) | β⁻n→84Se(62.6%) β⁻→85Se(37.4%) | 1967 |
| 86As | 53 | 85.9367 | -58,962.0 | --- | 945.0 ms | (1-) | β⁻→86Se(64.5%) β⁻n→85Se(35.5%) β⁻n→84Se | 1973 |
| 87As | 54 | 86.9403 | -55,617.9 | --- | 492.0 ms | (5/2-) | β⁻→87Se(84.6%) β⁻n→86Se(15.4%) β⁻n→85Se | 1970 |
| 88As | 55 | 87.9458 | -50,450.0 | --- | 270.0 ms | --- | β⁻→88Se(100%) β⁻n→87Se | 1994 |
| 89As | 56 | 88.95 | -46,530.0 | --- | 220.0 ms | (5/2-) | β⁻→89Se β⁻n→88Se β⁻n→87Se | 1994 |
| 90As | 57 | 89.956 | -40,990.0 | --- | 70.0 ms | --- | β⁻→90Se β⁻n→89Se β⁻n→88Se | 1997 |
| 90mAs | 57 | 89.9561 | -40,870.0 | --- | 220.0 ns | --- | γ→90As(100%) | 2012 |
| 91As | 58 | 90.9608 | -36,500.0 | --- | 100.0 ms | (5/2-) | β⁻→91Se β⁻n→90Se β⁻n→89Se | 1997 |
| 92As | 59 | 91.9674 | -30,380.0 | --- | 45.0 ms | --- | β⁻→92Se β⁻n→91Se β⁻n→90Se | 1997 |