Ac
Actinium-217m
Protons (Z)
89
Neutrons (N)
128
Mass number
217
Half-Life
740.0 ns
Abundance
---
Mass
217.012 u
Mass Excess
10,715.0 keV
Spin
29/2+
Discovered
1973
Binding energy per nucleon
7,701 keV
Neutron separation energy
5,506 keV
Proton separation energy
-135 keV
Decay Mode
Decay chain
- AcActinium-217Z 89 · N 128740.0 ns
- γ95.49%
- α100%
- α99.44%
- β⁺96.1%
- α99.546%
- EC100%