At
Astatine-222
Protons (Z)
85
Neutrons (N)
137
Mass number
222
Half-Life
54.0 s
Abundance
---
Mass
222.022 u
Mass Excess
20,953.0 keV
Spin
---
Discovered
1989
Binding energy per nucleon
7,677 keV
Neutron separation energy
3,901 keV
Proton separation energy
6,110 keV
Decay Mode
- β⁻→Radon-222100%
Decay chain
- AtAstatine-222Z 85 · N 13754.0 s
- β⁻100%
- α100%
- α99.98%
- β⁻100%
- β⁻99.976%
- α100%
- β⁻~100%
- β⁻~100%
- α100%