Fr
Francium-222
Protons (Z)
87
Neutrons (N)
135
Mass number
222
Half-Life
14.2 m
Abundance
---
Mass
222.018 u
Mass Excess
16,378.0 keV
Spin
2-
Discovered
1975
Binding energy per nucleon
7,691 keV
Neutron separation energy
4,970 keV
Proton separation energy
5,382 keV
Decay Mode
- β⁻→Radium-222100%
Decay chain
- FrFrancium-222Z 87 · N 13514.2 m
- β⁻100%
- α~100%
- α100%
- α100%
- β⁻~100%
- β⁻~100%
- α100%