Periodic Table of Elements
No - Nobelium
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Nuclides / Isotopes
| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| No249 | 249.088 | 147 | Syn | ||||||
| No250 | 250.087 | 148 | Syn | 0+ | 0.25ms |  | Fm246 | ~0.05 | 9.000 |
| 0.25ms | SF | ||||||||
| No251 | 251.089 | 149 | Syn | 0.8s | | Fm247 | ~100 | 8.890 | |
| 0.8s | SF | <10 | 3.780 | ||||||
| 0.8s |  | Md251 | ~1 | 3.780 | |||||
| No252 | 252.089 | 150 | Syn | 0+ | 2.3s | | Fm248 | 73.1 | 8.549 |
| 2.3s | SF | 26.9 | |||||||
| No253 | 253.091 | 151 | Syn | 9/2- | 1.7m | | Fm249 | ~80 | 8.440 |
| 1.7m | | Md253 | ~20 | 3.200 | |||||
| No254 | 254.0909 | 152 | Syn | 0+ | 55s | | Fm250 | 90 | 8.226 |
| 55s | | Md254 | 10 | 1.140 | |||||
| 55s | SF | 0.25 | |||||||
| meta state 0.500MeV | Syn | 0.28s | IT | >80 | 0.500 | ||||
| 0.28s | SF | >=0.2 | 0.500 | ||||||
| No255 | 255.0932 | 153 | Syn | 1/2+ | 3.1m | | Fm251 | 61.4 | 8.445 |
| 3.1m | | Md255 | 38.6 | 2.012 | |||||
| No256 | 256.0944 | 154 | Syn | 0+ | 2.91s | | Fm252 | 99.5 | 8.581 |
| 2.91s | SF | 0.5 | |||||||
| No257 | 257.0969 | 155 | Syn | 7/2+ | 25s | | Fm253 | ~100 | 8.450 |
| No258 | 258.098 | 156 | Syn | 0+ | ~1.2ms | | Fm254 | 8.200 | |
| ~1.2ms | SF | ||||||||
| No259 | 259.101 | 157 | Syn | 9/2+ | 58m | | Fm255 | 75 | 7.910 |
| 58m | | Md259 | 25 | 0.500 | |||||
| 58m | SF | <10 | |||||||
| No260 | 260.103 | 158 | Syn | 0+ | 106ms | SF | |||
| No261 | 261.106 | 159 | Syn | ||||||
| No262 | 262.108 | 160 | Syn | 0+ | ~5ms | SF | |||
| No263 | 161 | Syn | |||||||
| Nuclide | Potential Parent Nuclides |
|---|---|
| No249 | Rf253 (Syn) |
| No250 | Rf254 (Syn) |
| No251 | Rf255 (Syn) |
| No252 | Lr252 (Syn) Rf256 (Syn) |
| No253 | Lr253 (Syn) Rf257 (Syn) |
| No254 | Lr254 (Syn) Rf258 (Syn) |
| meta state 0.500MeV | None known |
| No255 | Rf259 (Syn) |
| No256 | Lr256 (Syn) Rf260 (Syn) |
| No257 | Rf261 (Syn) |
| No258 | Lr258 (Syn) |
| No259 | Lr259 (Syn) |
| No260 | Lr260 (Syn) Md260 (Syn) |
| No261 | None known |
| No262 | Lr262 (Syn) |
| No263 | None known |
Key:
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