It's Elemental
Isotopes of the Element Argon
Argon
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 |
| 36 | 0.3336% | STABLE |
| 38 | 0.0629% | STABLE |
| 40 | 99.6035% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 30 | 20 nanoseconds | Proton Emission (suspected) | No Data Available |
| 31 | 14.4 milliseconds | Electron Capture with delayed Proton Emission | 62.00% |
| Electron Capture with delayed Double Proton Emission | 8.50% | ||
| Electron Capture | 100.00% | ||
| 32 | 100.5 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 35.60% | ||
| 33 | 173.0 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 38.70% | ||
| 34 | 844.5 milliseconds | Electron Capture | 100.00% |
| 35 | 1.7756 seconds | Electron Capture | 100.00% |
| 36 | STABLE | - | - |
| 37 | 35.04 days | Electron Capture | 100.00% |
| 38 | STABLE | - | - |
| 39 | 269 years | Beta-minus Decay | 100.00% |
| 40 | STABLE | - | - |
| 41 | 109.61 minutes | Beta-minus Decay | 100.00% |
| 42 | 32.9 years | Beta-minus Decay | 100.00% |
| 43 | 5.37 minutes | Beta-minus Decay | 100.00% |
| 44 | 11.87 minutes | Beta-minus Decay | 100.00% |
| 45 | 21.48 seconds | Beta-minus Decay | 100.00% |
| 46 | 8.4 seconds | Beta-minus Decay | 100.00% |
| 47 | 1.23 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | < 0.20% | ||
| 48 | 475 milliseconds | Beta-minus Decay | 100.00% |
| 49 | 170 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 65.00% | ||
| 50 | 85 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 35.00% | ||
| 51 | > 200 nanoseconds | Beta-minus Decay | No Data Available |
| 52 | > 620 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 53 | > 620 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 53m | 620 nanoseconds | Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available |
| 53m1 | > 620 nanoseconds | Beta-minus Decay with delayed Double Neutron Emission (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.