At
Astatine-205m
Protons (Z)
85
Neutrons (N)
120
Mass number
205
Half-Life
7.76 µs
Abundance
---
Mass
204.989 u
Mass Excess
-10,645.0 keV
Spin
29/2+
Discovered
1982
Binding energy per nucleon
7,799 keV
Neutron separation energy
6,841 keV
Proton separation energy
-407 keV
Decay Mode
- γ→Astatine-205100%
Decay chain
- AtAstatine-205Z 85 · N 1207.76 µs
- γ100%
- β⁺90%
- β⁺99.96%
- β⁺100%
- EC100%