Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
| Mass Number | Natural Abundance | Half-life |
| 24 | 78.99% | STABLE |
| 25 | 10.00% | STABLE |
| 26 | 11.01% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 19 | 4.0 picoseconds | Double Proton Emission | 100.00% |
| 20 | 90.8 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | ~ 27.00% | ||
| 21 | 122 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 32.60% | ||
| Electron Capture with delayed Alpha Decay | < 0.50% | ||
| 22 | 3.8755 seconds | Electron Capture | 100.00% |
| 23 | 11.317 seconds | Electron Capture | 100.00% |
| 24 | STABLE | - | - |
| 25 | STABLE | - | - |
| 26 | STABLE | - | - |
| 27 | 9.458 minutes | Beta-minus Decay | 100.00% |
| 28 | 20.915 hours | Beta-minus Decay | 100.00% |
| 29 | 1.30 seconds | Beta-minus Decay | 100.00% |
| 30 | 335 milliseconds | Beta-minus Decay | 100.00% |
| 31 | 232 milliseconds | Beta-minus Decay with delayed Neutron Emission | 1.70% |
| Beta-minus Decay | 100.00% | ||
| 32 | 86 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 5.50% | ||
| 33 | 90.5 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 14.00% | ||
| 34 | 20 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 35 | 70 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 52.00% | ||
| 36 | 3.9 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 37 | > 260 nanoseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 38 | > 260 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 39 | < 180 nanoseconds | Neutron Emission | No Data Available |
| 40 | > 170 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.