B
Boron
Z 5 10.81 g/molMetalloid
| 11B | 6 | 11.0093 | 8,667.708 | 80.35% | Stable | 3/2- | --- | 1920 |
| 10B | 5 | 10.0129 | 12,050.611 | 19.65% | Stable | 3+ | --- | 1920 |
| 6B | 1 | 6.0508 | 47,320.0 | --- | --- | (2-) | p→4Li | --- |
| 7B | 2 | 7.0297 | 27,677.0 | --- | 570.0 ys | (3/2-) | p→6Be(100%) | 1967 |
| 8B | 3 | 8.0246 | 22,921.6 | --- | 771.9 ms | 2+ | β⁺α→4He(100%) | 1950 |
| 9B | 4 | 9.0133 | 12,416.5 | --- | 800.0 zs | 3/2- | p→8Be(100%) | 1940 |
| 12B | 7 | 12.0144 | 13,369.4 | --- | 20.2 ms | 1+ | β⁻→12C(99.4%) β⁻α→8Be(0.6%) | 1935 |
| 13B | 8 | 13.0178 | 16,561.9 | --- | 17.16 ms | 3/2- | β⁻→13C(99.734%) β⁻n→12C(0.266%) | 1956 |
| 14B | 9 | 14.0254 | 23,664.0 | --- | 12.36 ms | 2- | β⁻→14C(93.96%) β⁻n→13C(6.04%) β⁻n→12C | 1966 |
| 15B | 10 | 15.0311 | 28,957.0 | --- | 10.18 ms | 3/2- | β⁻n→14C(98.7%) β⁻n→13C(<1.5%) β⁻→15C(1.3%) | 1966 |
| 16B | 11 | 16.0398 | 37,112.0 | --- | --- | (0-) | n→15B | 2000 |
| 17B | 12 | 17.0469 | 43,720.0 | --- | 5.08 ms | (3/2-) | β⁻n→16C(63%) β⁻→17C(21.1%) β⁻n→15C(12%) β⁻n→14C(3.5%) β⁻n(0.4%) | 1973 |
| 18B | 13 | 18.0556 | 51,790.0 | --- | --- | (2-) | n→17B(100%) | 2010 |
| 19B | 14 | 19.0642 | 59,770.0 | --- | 2.92 ms | (3/2-) | β⁻n→18C(71%) β⁻n→17C(17%) β⁻→19C(12%) β⁻n→16C(<9.1%) | 1984 |
| 20B | 15 | 20.0745 | 69,400.0 | --- | --- | (1-) | n→19B(100%) β⁻n→19C β⁻n→18C | 2018 |
| 21B | 16 | 21.0841 | 78,380.0 | --- | --- | (3/2-) | n→19B(100%) | 2018 |