Fr
Francium-220
Protons (Z)
87
Neutrons (N)
133
Mass number
220
Half-Life
27.4 s
Abundance
---
Mass
220.012 u
Mass Excess
11,482.0 keV
Spin
1+
Discovered
1948
Binding energy per nucleon
7,710 keV
Neutron separation energy
5,206 keV
Proton separation energy
4,636 keV
Decay Mode
Decay chain
- FrFrancium-220Z 87 · N 13327.4 s
- α~100%
- α100%
- β⁻64.046%
- α100%