Fr
Francium-209m
Protons (Z)
87
Neutrons (N)
122
Mass number
209
Half-Life
420.0 ns
Abundance
---
Mass
209.001 u
Mass Excess
878.0 keV
Spin
45/2-
Discovered
2006
Binding energy per nucleon
7,741 keV
Neutron separation energy
4,528 keV
Proton separation energy
-3,244 keV
Decay Mode
- γ→Francium-209100%
Decay chain
- FrFrancium-209Z 87 · N 122420.0 ns
- γ100%
- α89%
- β⁺90%
- β⁺99.96%
- β⁺100%
- EC100%