Rn
Radon-221
Protons (Z)
86
Neutrons (N)
135
Mass number
221
Half-Life
25.7 m
Abundance
---
Mass
221.016 u
Mass Excess
14,471.0 keV
Spin
7/2+
Discovered
1956
Binding energy per nucleon
7,701 keV
Neutron separation energy
4,212 keV
Proton separation energy
7,194 keV
Decay Mode
Decay chain
- RnRadon-221Z 86 · N 13525.7 m
- β⁻78%
- α~100%
- α99.992%
- β⁻97.91%
- α100%
- β⁻100%
- α100%