Be
Beryllium
Z 4 9.012 g/molAlkaline Earth Metal
| 9Be | 5 | 9.0122 | 11,348.45 | 100.0% | Stable | 3/2- | --- | 1921 |
| 5Be | 1 | 5.0399 | 37,140.0 | --- | --- | (1/2+) | p→4Li | --- |
| 6Be | 2 | 6.0197 | 18,375.0 | --- | 5.0 zs | 0+ | p→4He(100%) | 1958 |
| 7Be | 3 | 7.0169 | 15,769.0 | --- | 53.22 d | 3/2- | EC→7Li(100%) | 1938 |
| 8Be | 4 | 8.0053 | 4,941.67 | --- | 81.9 as | 0+ | α→4He(100%) | 1932 |
| 10Be | 6 | 10.0135 | 12,607.49 | --- | 1.39 My | 0+ | β⁻→10B(100%) | 1935 |
| 11Be | 7 | 11.0217 | 20,177.17 | --- | 13.76 s | 1/2+ | β⁻→11B(96.699%) β⁻α→7Li(3.3%) β⁻p(0.001%) β⁻n→10B | 1958 |
| 12Be | 8 | 12.0269 | 25,077.8 | --- | 21.46 ms | 0+ | β⁻→12B(99.5%) β⁻n→11B(0.5%) | 1966 |
| 12mBe | 8 | 12.0293 | 27,328.8 | --- | 233.0 ns | 0+ | γ→12Be(100%) | 2007 |
| 13Be | 9 | 13.0361 | 33,659.0 | --- | 1.0 zs | (1/2-) | n→12Be | 1983 |
| 14Be | 10 | 14.0429 | 39,950.0 | --- | 4.53 ms | 0+ | β⁻n→13B(86%) β⁻→14B(8.98%) β⁻n→12B(5%) β⁻→11Be(0.02%) β⁻α→10Li(<0.004%) | 1973 |
| 15Be | 11 | 15.0535 | 49,830.0 | --- | 790.0 ys | (5/2+) | n→14Be(100%) | 2013 |
| 16Be | 12 | 16.0617 | 57,450.0 | --- | 650.0 ys | 0+ | n→14Be(100%) | 2012 |