At
Astatine-221
Protons (Z)
85
Neutrons (N)
136
Mass number
221
Half-Life
2.3 m
Abundance
---
Mass
221.018 u
Mass Excess
16,783.0 keV
Spin
(3/2-)
Discovered
1989
Binding energy per nucleon
7,694 keV
Neutron separation energy
5,664 keV
Proton separation energy
5,769 keV
Decay Mode
- β⁻→Radon-221100%
Decay chain
- AtAstatine-221Z 85 · N 1362.3 m
- β⁻100%
- β⁻78%
- α~100%
- α99.992%
- β⁻97.91%
- α100%
- β⁻100%
- α100%