Periodic Table of Elements
Fm - Fermium
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Nuclides / Isotopes
| Nuc- lide | Atomic Mass | NN | Abun % | Spin | Half Life | DM | DT | BR % | Decay Energy (MeV) |
|---|---|---|---|---|---|---|---|---|---|
| Fm242 | 242.073 | 142 | Syn | 0+ | 0.8ms | SF | |||
| Fm243 | 243.075 | 143 | Syn | 0.18s |  | Cf239 | <=100 | 8.690 | |
| 0.18s | SF | <=0.36 | 8.690 | ||||||
| Fm244 | 244.074 | 144 | Syn | 0+ | 3.3ms | SF | <=100 | ||
| Fm245 | 245.075 | 145 | Syn | 4.2s | | Cf241 | <=100 | 8.440 | |
| 4.2s | SF | <=0.11 | |||||||
| Fm246 | 246.0753 | 146 | Syn | 0+ | 1.1s | | Cf242 | 92 | 8.374 |
| 1.1s | SF | 8 | |||||||
| 1.1s |  | Es246 | <=1 | 2.160 | |||||
| Fm247 | 247.077 | 147 | Syn | 35s | | Cf243 | >=50 | 8.190 | |
| 35s | | Es247 | <=50 | 8.190 | |||||
| Fm248 | 248.0772 | 148 | Syn | 0+ | 36s | | Cf244 | 99 | 8.002 |
| 36s | | Es248 | ~1 | 1.600 | |||||
| 36s | SF | ~0.05 | |||||||
| Fm249 | 249.079 | 149 | Syn | 7/2+ | 2.6m | | Es249 | ~85 | 2.440 |
| 2.6m | | Cf245 | ~15 | 7.810 | |||||
| 2.6m | | ||||||||
| 2.6m | | ||||||||
| Fm250 | 250.0795 | 150 | Syn | 0+ | 30m | | Cf246 | >90 | 7.557 |
| 30m | | Es250 | <10 | 0.800 | |||||
| 30m | SF | ~0.0006 | 0.800 | ||||||
| meta state 1.000MeV | Syn | 1.8s | IT | Fm250 | >80 | 1.000 | |||
| 1.8s | SF | 1.000 | |||||||
| Fm251 | 251.0816 | 151 | Syn | 9/2- | 5.3h | | Es251 | 98.2 | 1.474 |
| 5.3h | | Cf247 | 1.8 | 7.425 | |||||
| Fm252 | 252.0825 | 152 | Syn | 0+ | 25.39h | SF | 0.0023 | ||
| 25.39h | | Cf248 | 7.153 | ||||||
| Fm253 | 253.0852 | 153 | Syn | 1/2+ | 3d | | Es253 | 88 | 0.333 |
| 3d | | Cf249 | 12 | 7.197 | |||||
| Fm254 | 254.0869 | 154 | Syn | 0+ | 3.24h | | Cf250 | 99.94 | 7.307 |
| 3.24h | SF | 0.06 | |||||||
| Fm255 | 255.09 | 155 | Syn | 7/2+ | 20.07h | SF | 0.00002 | ||
| 20.07h | | Cf251 | 7.241 | ||||||
| Fm256 | 256.0918 | 156 | Syn | 0+ | 157.6m | SF | 91.9 | ||
| 157.6m | | Cf252 | 8.1 | 7.027 | |||||
| Fm257 | 257.0951 | 157 | Syn | 9/2+ | 100.5d | | Cf253 | 99.79 | 6.864 |
| 100.5d | SF | 0.21 | |||||||
| Fm258 | 258.097 | 158 | Syn | 0+ | 370us | SF | |||
| Fm259 | 259.101 | 159 | Syn | 1.5s | SF | ||||
| Fm260 | 160 | Syn | 0+ | ~4ms | |||||
| Nuclide | Potential Parent Nuclides |
|---|---|
| Fm242 | None known |
| Fm243 | None known |
| Fm244 | None known |
| Fm245 | None known |
| Fm246 | No250 (Syn) |
| Fm247 | No251 (Syn) |
| Fm248 | Md248 (Syn) No252 (Syn) |
| Fm249 | Md249 (Syn) No253 (Syn) |
| Fm250 | Fm250m (Syn) Md250 (Syn) No254 (Syn) |
| meta state 1.000MeV | None known |
| Fm251 | Md251 (Syn) No255 (Syn) |
| Fm252 | Es252 (Syn) Md252 (Syn) No256 (Syn) |
| Fm253 | Md253 (Syn) No257 (Syn) |
| Fm254 | Es254 (Syn) Es254m (Syn) Md254 (Syn) No258 (Syn) |
| Fm255 | Es255 (Syn) Md255 (Syn) No259 (Syn) |
| Fm256 | Es256 (Syn) Es256m (Syn) Md256 (Syn) |
| Fm257 | Md257 (Syn) |
| Fm258 | Md258 (Syn) |
| Fm259 | None known |
| Fm260 | Md260 (Syn) |
Key:
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