Fm
Fermium-256
Protons (Z)
100
Neutrons (N)
156
Mass number
256
Half-Life
2.62 h
Abundance
---
Mass
256.092 u
Mass Excess
85,485.0 keV
Spin
0+
Discovered
1955
Binding energy per nucleon
7,432 keV
Neutron separation energy
6,386 keV
Proton separation energy
5,893 keV
Decay Mode
- SF91.9%
- α→Californium-2528.1%
Decay chain
- FmFermium-256Z 100 · N 1562.62 h
- α8.1%
- α96.897%
- α91.61%
- α99.877%
- β⁻100%
- β⁻100%
- α~100%
- α~100%
- α~100%
- β⁻100%
- β⁻100%
- α~100%
- α~100%
- α100%
- α100%
- β⁻100%
- β⁻64.046%
- α100%