Notes
| Isotopes of Fermium |
| Notes
|
| Fermium has no stable isotopes. |
 Notable Isotopes  |
 252Fm [152 neutrons] |
 Abundance: synthetic
|
| Half life: 25.39 hours
|
| Decay Energy: ? MeV |
| Decays to ?.
|
| Half life: 25.39 hours [ Alpha Decay ]
|
| Decay Energy: 7.153 MeV |
| Decays to 248Cf.
|
| 253Fm [153 neutrons] |
| Abundance: synthetic
|
| Half life: 3 days [ Electron Capture ]
|
| Decay Energy: 0.333 MeV |
| Decays to 253Es.
|
| Half life: 3 days [ Alpha Decay ]
|
| Decay Energy: 7.197 MeV |
| Decays to 249Cf.
|
| 255Fm [155 neutrons] |
| Abundance: synthetic
|
| Half life: 20.07 hours
|
| Decay Energy: ? MeV |
| Decays to ?.
|
| Half life: 20.07 hours [ Alpha Decay ]
|
| Decay Energy: 7.241 MeV |
| Decays to 251Cf.
|
| 257Fm [157 neutrons] |
| Abundance: synthetic
|
| Half life: 100.5 days [ Alpha Decay ]
|
| Decay Energy: 6.864 MeV |
| Decays to 253Cf.
|
| Half life: 100.5 days
|
| Decay Energy: ? MeV |
| Decays to ?.
|