Fm
Fermium-258
Protons (Z)
100
Neutrons (N)
158
Mass number
258
Half-Life
370.0 µs
Abundance
---
Mass
258.097 u
Mass Excess
90,430.0 keV
Spin
0+
Discovered
1971
Binding energy per nucleon
7,418 keV
Neutron separation energy
6,231 keV
Proton separation energy
6,259 keV
Decay Mode
- SF100%
- α→Californium-254
Decay chain
- FmFermium-258Z 100 · N 158370.0 µs
- α
- α0.31%
- α
- β⁻100%
- β⁻100%
- α99.974%
- α~100%
- α~100%
- β⁻100%
- β⁻100%
- α~100%
- α~100%
- α~100%
- α100%
- α99.98%
- β⁻100%
- β⁻99.976%
- α100%
- β⁻~100%
- β⁻~100%
- α100%