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 |
| 74 | 0.89% | STABLE |
| 76 | 9.37% | STABLE |
| 77 | 7.63% | STABLE |
| 78 | 23.77% | STABLE |
| 80 | 49.61% | STABLE |
| 82 | 8.73% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 64 | > 180 nanoseconds | Electron Capture | 100.00% |
| 65 | 33 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 100.00% | ||
| 66 | No Data Available | No Data Available | No Data Available |
| 67 | 136 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.50% | ||
| 68 | 35.5 seconds | Electron Capture | 100.00% |
| 69 | 27.4 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.05% | ||
| 70 | 41.1 minutes | Electron Capture | 100.00% |
| 71 | 4.74 minutes | Electron Capture | 100.00% |
| 72 | 8.40 days | Electron Capture | 100.00% |
| 73 | 7.15 hours | Electron Capture | 100.00% |
| 73m | 39.8 minutes | Isomeric Transition | 72.60% |
| Electron Capture | 27.40% | ||
| 74 | STABLE | - | - |
| 75 | 119.79 days | Electron Capture | 100.00% |
| 76 | STABLE | - | - |
| 77 | STABLE | - | - |
| 77m | 17.4 seconds | Isomeric Transition | 100.00% |
| 78 | STABLE | - | - |
| 79 | 2.95×10+5 years | Beta-minus Decay | 100.00% |
| 79m | 3.92 minutes | Isomeric Transition | 99.94% |
| Beta-minus Decay | 0.06% | ||
| 80 | STABLE | - | - |
| 81 | 18.45 minutes | Beta-minus Decay | 100.00% |
| 81m | 57.28 minutes | Isomeric Transition | 99.95% |
| Beta-minus Decay | 0.05% | ||
| 82 | STABLE | - | - |
| 83 | 22.3 minutes | Beta-minus Decay | 100.00% |
| 83m | 70.1 seconds | Beta-minus Decay | 100.00% |
| 84 | 3.26 minutes | Beta-minus Decay | 100.00% |
| 85 | 32.9 seconds | Beta-minus Decay | 100.00% |
| 86 | 14.3 seconds | Beta-minus Decay | 100.00% |
| 87 | 5.50 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.20% | ||
| 88 | 1.53 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.67% | ||
| 89 | 0.41 seconds | Beta-minus Decay with delayed Neutron Emission | 7.80% |
| Beta-minus Decay | 100.00% | ||
| 90 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 91 | 0.27 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 21.00% | ||
| 92 | No Data Available | Beta-minus Decay | 100.00% |
| 93 | No Data Available | Beta-minus Decay | 100.00% |
| 94 | > 150 nanoseconds | Beta-minus Decay | 100.00% |
| 95 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 95m | 300 nanoseconds | Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available |
| 95m1 | > 300 nanoseconds | Beta-minus Decay with delayed Double Neutron Emission (suspected) | No Data Available |
This page is maintained by Steve Gagnon.