At
Astatine-197m
Protons (Z)
85
Neutrons (N)
112
Mass number
197
Half-Life
2.0 s
Abundance
---
Mass
196.993 u
Mass Excess
-6,311.0 keV
Spin
1/2+
Discovered
1985
Binding energy per nucleon
7,766 keV
Neutron separation energy
10,472 keV
Proton separation energy
131 keV
Decay Mode
Decay chain
- AtAstatine-197Z 85 · N 1122.0 s
- α~100%
- β⁺96.5%
- β⁺
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%