It's Elemental
Isotopes of the Element Mercury
Mercury
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 |
| 196 | 0.15% | STABLE |
| 198 | 9.97% | STABLE |
| 199 | 16.87% | STABLE |
| 200 | 23.10% | STABLE |
| 201 | 13.18% | STABLE |
| 202 | 29.86% | STABLE |
| 204 | 6.87% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 171 | 59 microseconds | Alpha Decay | 100.00% |
| 172 | 231 microseconds | Alpha Decay | 100.00% |
| 173 | 0.6 milliseconds | Alpha Decay | 100.00% |
| 174 | 2.1 milliseconds | Alpha Decay | 99.60% |
| 175 | 10.6 milliseconds | Alpha Decay | 100.00% |
| 176 | 20.3 milliseconds | Alpha Decay | 94.00% |
| 177 | 118 milliseconds | Alpha Decay | 100.00% |
| 178 | 266.5 milliseconds | Alpha Decay | ~ 70.00% |
| Electron Capture | ~ 30.00% | ||
| 179 | 1.05 seconds | Electron Capture | 45.00% |
| Electron Capture with delayed Proton Emission | ~ 0.15% | ||
| Alpha Decay | 55.00% | ||
| 180 | 2.58 seconds | Electron Capture | 52.00% |
| Alpha Decay | 48.00% | ||
| 181 | 3.6 seconds | Electron Capture | 73.00% |
| Alpha Decay | 27.00% | ||
| Electron Capture with delayed Proton Emission | 0.01% | ||
| Electron Capture with delayed Alpha Decay | 9.0×10-6 % | ||
| 182 | 10.83 seconds | Electron Capture | 84.80% |
| Alpha Decay | 15.20% | ||
| 183 | 9.4 seconds | Alpha Decay | 11.70% |
| Electron Capture with delayed Proton Emission | 2.6×10-4 % | ||
| Electron Capture | 88.30% | ||
| 184 | 30.87 seconds | Electron Capture | 98.89% |
| Alpha Decay | 1.11% | ||
| 185 | 49.1 seconds | Electron Capture | 94.00% |
| Alpha Decay | 6.00% | ||
| 185m | 21.6 seconds | Isomeric Transition | 54.00% |
| Electron Capture | 46.00% | ||
| Alpha Decay | ~ 0.03% | ||
| 186 | 1.38 minutes | Alpha Decay | 0.02% |
| Electron Capture | 99.98% | ||
| 187 | 2.4 minutes | Electron Capture | 100.00% |
| Alpha Decay | < 3.7×10-4 % | ||
| 187m | 1.9 minutes | Electron Capture | 100.00% |
| Alpha Decay | < 3.7×10-4 % | ||
| 188 | 3.25 minutes | Electron Capture | 100.00% |
| Alpha Decay | 3.7×10-5 % | ||
| 189 | 7.6 minutes | Electron Capture | 100.00% |
| Alpha Decay | < 3.0×10-5 % | ||
| 189m | 8.6 minutes | Electron Capture | 100.00% |
| Alpha Decay | < 3.0×10-5 % | ||
| 190 | 20.0 minutes | Electron Capture | 100.00% |
| Alpha Decay | < 3.4×10-7 % | ||
| 191 | 49 minutes | Electron Capture | 100.00% |
| Alpha Decay | 5.0×10-6 % | ||
| 191m | 50.8 minutes | Electron Capture | 100.00% |
| 192 | 4.85 hours | Electron Capture | 100.00% |
| 193 | 3.80 hours | Electron Capture | 100.00% |
| 193m | 11.8 hours | Electron Capture | 92.80% |
| Isomeric Transition | 7.20% | ||
| 194 | 444 years | Electron Capture | 100.00% |
| 195 | 10.53 hours | Electron Capture | 100.00% |
| 195m | 41.6 hours | Isomeric Transition | 54.20% |
| Electron Capture | 45.80% | ||
| 196 | STABLE | - | - |
| 197 | 64.14 hours | Electron Capture | 100.00% |
| 197m | 23.8 hours | Isomeric Transition | 91.40% |
| Electron Capture | 8.60% | ||
| 198 | STABLE | - | - |
| 199 | STABLE | - | - |
| 199m | 42.67 minutes | Isomeric Transition | 100.00% |
| 200 | STABLE | - | - |
| 201 | STABLE | - | - |
| 202 | STABLE | - | - |
| 203 | 46.594 days | Beta-minus Decay | 100.00% |
| 204 | STABLE | - | - |
| 205 | 5.14 minutes | Beta-minus Decay | 100.00% |
| 205m | 1.09 milliseconds | Isomeric Transition | 100.00% |
| 206 | 8.32 minutes | Beta-minus Decay | 100.00% |
| 207 | 2.9 minutes | Beta-minus Decay | 100.00% |
| 208 | 41 minutes | Beta-minus Decay | 100.00% |
| 209 | 35 seconds | Beta-minus Decay | 100.00% |
| 210 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 211 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 212 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 213 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 214 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 215 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 216 | > 300 nanoseconds | Beta-minus Decay with delayed Neutron Emission | No Data Available |
| Beta-minus Decay | No Data Available |
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