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 |
| 85 | 72.17% | STABLE |
| 87 | 27.83% | 4.81×10+10 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 71 | No Data Available | Proton Emission (suspected) | No Data Available |
| 72 | 1.2 microseconds | Proton Emission (suspected) | No Data Available |
| 73 | 30 nanoseconds | Electron Capture (suspected) | No Data Available |
| 73m | < 30 nanoseconds | Proton Emission | > 0.00% |
| 74 | 64.9 milliseconds | Electron Capture | 100.00% |
| 75 | 19.0 seconds | Electron Capture | 100.00% |
| 76 | 36.5 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Alpha Decay | 3.8×10-7 % | ||
| 77 | 3.77 minutes | Electron Capture | 100.00% |
| 78 | 17.66 minutes | Electron Capture | 100.00% |
| 78m | 5.74 minutes | Isomeric Transition | 9.00% |
| Electron Capture | 91.00% | ||
| 79 | 22.9 minutes | Electron Capture | 100.00% |
| 80 | 33.4 seconds | Electron Capture | 100.00% |
| 81 | 4.572 hours | Electron Capture | 100.00% |
| 81m | 30.5 minutes | Isomeric Transition | 97.60% |
| Electron Capture | 2.40% | ||
| 82 | 1.2575 minutes | Electron Capture | 100.00% |
| 82m | 6.472 hours | Electron Capture | 100.00% |
| Isomeric Transition | < 0.33% | ||
| 83 | 86.2 days | Electron Capture | 100.00% |
| 84 | 32.82 days | Beta-minus Decay | 3.90% |
| Electron Capture | 96.10% | ||
| 84m | 20.26 minutes | Isomeric Transition | 100.00% |
| 85 | STABLE | - | - |
| 86 | 18.642 days | Beta-minus Decay | 99.99% |
| Electron Capture | 5.2×10-3 % | ||
| 86m | 1.017 minutes | Isomeric Transition | 100.00% |
| Beta-minus Decay | < 0.30% | ||
| 87 | 4.81×10+10 years | Beta-minus Decay | 100.00% |
| 88 | 17.773 minutes | Beta-minus Decay | 100.00% |
| 89 | 15.15 minutes | Beta-minus Decay | 100.00% |
| 90 | 158 seconds | Beta-minus Decay | 100.00% |
| 90m | 258 seconds | Beta-minus Decay | 97.40% |
| Isomeric Transition | 2.60% | ||
| 91 | 58.4 seconds | Beta-minus Decay | 100.00% |
| 92 | 4.492 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.01% | ||
| 93 | 5.84 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.39% | ||
| 94 | 2.702 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 10.50% | ||
| 95 | 377.7 milliseconds | Beta-minus Decay with delayed Neutron Emission | 8.70% |
| Beta-minus Decay | 100.00% | ||
| 96 | 203 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 13.30% | ||
| 97 | 169.1 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 25.50% | ||
| 98 | 102 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 13.80% | ||
| Beta-minus Decay with delayed Double Neutron Emission | 0.05% | ||
| 98m | 96 milliseconds | Beta-minus Decay | 100.00% |
| 99 | 54 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 15.80% | ||
| 100 | 51 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 6.00% | ||
| Beta-minus Decay with delayed Double Neutron Emission | 0.16% | ||
| 101 | 32 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 28.00% | ||
| 102 | 37 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 18.00% | ||
| 103 | > 633 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.