Ac
Actinium-225
Protons (Z)
89
Neutrons (N)
136
Mass number
225
Half-Life
9.92 d
Abundance
---
Mass
225.023 u
Mass Excess
21,637.0 keV
Spin
3/2-
Discovered
1947
Binding energy per nucleon
7,666 keV
Neutron separation energy
6,668 keV
Proton separation energy
4,478 keV
Decay Mode
Decay chain
- AcActinium-225Z 89 · N 1369.92 d
- α~100%
- α~100%
- α99.992%
- β⁻97.91%
- α100%
- β⁻100%
- α100%