Fr
Francium-231
Protons (Z)
87
Neutrons (N)
144
Mass number
231
Half-Life
17.6 s
Abundance
---
Mass
231.045 u
Mass Excess
42,081.0 keV
Spin
(1/2+)
Discovered
1985
Binding energy per nucleon
7,594 keV
Neutron separation energy
5,477 keV
Proton separation energy
7,378 keV
Decay Mode
- β⁻→Radium-231100%
Decay chain
- FrFrancium-231Z 87 · N 14417.6 s
- β⁻100%
- β⁻100%
- β⁻100%
- β⁻100%
- α~100%
- β⁻98.62%
- α100%
- α~100%
- α100%
- α~100%
- β⁻100%
- α~100%
- β⁻100%