Be
Берилій
Z 4 9,012 г/мольЛужноземельний метал
| 9Be | 5 | 9,0122 | 11 348,45 | 100,0% | Стабільний | 3/2- | --- | 1921 |
| 5Be | 1 | 5,0399 | 37 140,0 | --- | --- | (1/2+) | p→4Li | --- |
| 6Be | 2 | 6,0197 | 18 375,0 | --- | 5,0 зс | 0+ | p→4He(100%) | 1958 |
| 7Be | 3 | 7,0169 | 15 769,0 | --- | 53,22 д | 3/2- | EC→7Li(100%) | 1938 |
| 8Be | 4 | 8,0053 | 4 941,67 | --- | 81,9 ас | 0+ | α→4He(100%) | 1932 |
| 10Be | 6 | 10,0135 | 12 607,49 | --- | 1,39 Мр | 0+ | β⁻→10B(100%) | 1935 |
| 11Be | 7 | 11,0217 | 20 177,17 | --- | 13,76 с | 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 мс | 0+ | β⁻→12B(99,5%) β⁻n→11B(0,5%) | 1966 |
| 12mBe | 8 | 12,0293 | 27 328,8 | --- | 233,0 нс | 0+ | γ→12Be(100%) | 2007 |
| 13Be | 9 | 13,0361 | 33 659,0 | --- | 1,0 зс | (1/2-) | n→12Be | 1983 |
| 14Be | 10 | 14,0429 | 39 950,0 | --- | 4,53 мс | 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 йс | (5/2+) | n→14Be(100%) | 2013 |
| 16Be | 12 | 16,0617 | 57 450,0 | --- | 650,0 йс | 0+ | n→14Be(100%) | 2012 |