At
Astatine-199m
Protons (Z)
85
Neutrons (N)
114
Mass number
199
Half-Life
273.0 ms
Abundance
---
Mass
198.991 u
Mass Excess
-8,579.0 keV
Spin
1/2+
Discovered
2013
Binding energy per nucleon
7,780 keV
Neutron separation energy
9,941 keV
Proton separation energy
395 keV
Decay Mode
Decay chain
- AtAstatine-199Z 85 · N 114273.0 ms
- γ99%
- α89%
- β⁺~100%
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%