Science Education
Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
Isotopes With A Known Natural Abundance
| Mass Number | Natural Abundance | Half-life |
| 78 | 0.355% | >= 1.5×10+21 years |
| 80 | 2.286% | STABLE |
| 82 | 11.593% | STABLE |
| 83 | 11.500% | STABLE |
| 84 | 56.987% | STABLE |
| 86 | 17.279% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 69 | 32 milliseconds | Electron Capture | 100.00% |
| 70 | 52 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | <= 1.30% | ||
| 71 | 100 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 2.10% | ||
| 72 | 17.1 seconds | Electron Capture with delayed Proton Emission | < 1.0×10-6 % |
| Electron Capture | 100.00% | ||
| 73 | 27.3 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.25% | ||
| 74 | 11.50 minutes | Electron Capture | 100.00% |
| 75 | 4.29 minutes | Electron Capture | 100.00% |
| 76 | 14.8 hours | Electron Capture | 100.00% |
| 77 | 74.4 minutes | Electron Capture | 100.00% |
| 78 | >= 1.5×10+21 years | Double Electron Capture | No Data Available |
| 79 | 35.04 hours | Electron Capture | 100.00% |
| 79m | 50 seconds | Isomeric Transition | 100.00% |
| 80 | STABLE | - | - |
| 81 | 2.29×10+5 years | Electron Capture | 100.00% |
| 81m | 13.10 seconds | Isomeric Transition | 100.00% |
| Electron Capture | 2.5×10-3 % | ||
| 82 | STABLE | - | - |
| 83 | STABLE | - | - |
| 83m | 1.85 hours | Isomeric Transition | 100.00% |
| 84 | STABLE | - | - |
| 85 | 10.752 years | Beta-minus Decay | 100.00% |
| 85m | 4.480 hours | Beta-minus Decay | 78.60% |
| Isomeric Transition | 21.40% | ||
| 86 | STABLE | - | - |
| 87 | 76.3 minutes | Beta-minus Decay | 100.00% |
| 88 | 2.84 hours | Beta-minus Decay | 100.00% |
| 89 | 3.15 minutes | Beta-minus Decay | 100.00% |
| 90 | 32.32 seconds | Beta-minus Decay | 100.00% |
| 91 | 8.57 seconds | Beta-minus Decay | 100.00% |
| 92 | 1.840 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.03% | ||
| 93 | 1.286 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.95% | ||
| 94 | 212 milliseconds | Beta-minus Decay with delayed Neutron Emission | 1.11% |
| Beta-minus Decay | 100.00% | ||
| 95 | 0.114 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 2.87% | ||
| 96 | 80 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 3.70% | ||
| 97 | 63 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 6.70% | ||
| 98 | 46 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 7.00% | ||
| 99 | 13 milliseconds | Beta-minus Decay with delayed Neutron Emission | 11.00% |
| Beta-minus Decay | 100.00% | ||
| 100 | 7 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 101 | > 635 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| Beta-minus Decay with delayed Double Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.
