At
Astatine-203m
Protons (Z)
85
Neutrons (N)
118
Mass number
203
Half-Life
3.5 ms
Abundance
---
Mass
202.988 u
Mass Excess
-11,480.0 keV
Spin
1/2+
Discovered
2017
Binding energy per nucleon
7,800 keV
Neutron separation energy
8,956 keV
Proton separation energy
827 keV
Decay Mode
- γ→Astatine-203100%
Decay chain
- AtAstatine-203Z 85 · N 1183.5 ms
- γ100%
- β⁺69%
- β⁺99.89%
- β⁺100%
- EC100%