At
Astatine-209
Protons (Z)
85
Neutrons (N)
124
Mass number
209
Half-Life
5.42 h
Abundance
---
Mass
208.986 u
Mass Excess
-12,884.0 keV
Spin
9/2-
Discovered
1951
Binding energy per nucleon
7,815 keV
Neutron separation energy
8,485 keV
Proton separation energy
2,704 keV
Decay Mode
Decay chain
- AtAstatine-209Z 85 · N 1245.42 h
- β⁺96.1%
- α99.546%
- EC100%