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 |
| 45 | 100% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 36 | No Data Available | Proton Emission (suspected) | No Data Available |
| 37 | No Data Available | Proton Emission (suspected) | No Data Available |
| 38 | No Data Available | Proton Emission | No Data Available |
| 39 | < 300 nanoseconds | Proton Emission | 100.00% |
| 40 | 182.3 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.44% | ||
| Electron Capture with delayed Alpha Decay | 0.02% | ||
| 41 | 596.3 milliseconds | Electron Capture | 100.00% |
| 42 | 681.3 milliseconds | Electron Capture | 100.00% |
| 42m | 61.7 seconds | Electron Capture | 100.00% |
| 43 | 3.891 hours | Electron Capture | 100.00% |
| 44 | 3.97 hours | Electron Capture | 100.00% |
| 44m | 58.61 hours | Isomeric Transition | 98.80% |
| Electron Capture | 1.20% | ||
| 45 | STABLE | - | - |
| 45m | 318 milliseconds | Isomeric Transition | 100.00% |
| 46 | 83.79 days | Beta-minus Decay | 100.00% |
| 46m | 18.75 seconds | Isomeric Transition | 100.00% |
| 47 | 3.3492 days | Beta-minus Decay | 100.00% |
| 48 | 43.67 hours | Beta-minus Decay | 100.00% |
| 49 | 57.18 minutes | Beta-minus Decay | 100.00% |
| 50 | 102.5 seconds | Beta-minus Decay | 100.00% |
| 50m | 0.35 seconds | Isomeric Transition | > 97.50% |
| Beta-minus Decay | < 2.50% | ||
| 51 | 12.4 seconds | Beta-minus Decay | 100.00% |
| 52 | 8.2 seconds | Beta-minus Decay | 100.00% |
| 53 | 2.4 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available | ||
| 54 | 526 milliseconds | Beta-minus Decay | 100.00% |
| 55 | 96 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 17.00% | ||
| 56 | 26 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available | ||
| 56m | 75 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | > 14.00% | ||
| 57 | 22 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 58 | 12 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 59 | > 360 nanoseconds | Beta-minus Decay with delayed Neutron Emission | No Data Available |
| Beta-minus Decay | No Data Available | ||
| 60 | > 360 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 61 | > 360 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.