Ac
Actinium-222
Protons (Z)
89
Neutrons (N)
133
Mass number
222
Half-Life
5.0 s
Abundance
---
Mass
222.018 u
Mass Excess
16,622.0 keV
Spin
1-
Discovered
1949
Binding energy per nucleon
7,683 keV
Neutron separation energy
5,979 keV
Proton separation energy
3,631 keV
Decay Mode
Decay chain
- AcActinium-222Z 89 · N 1335.0 s
- α99%
- α100%
- α100%
- β⁻~100%
- α100%