Fr
Francium-209
Protons (Z)
87
Neutrons (N)
122
Mass number
209
Half-Life
50.5 s
Abundance
---
Mass
208.996 u
Mass Excess
-3,782.0 keV
Spin
9/2-
Discovered
1964
Binding energy per nucleon
7,764 keV
Neutron separation energy
9,188 keV
Proton separation energy
1,416 keV
Decay Mode
Decay chain
- FrFrancium-209Z 87 · N 12250.5 s
- α89%
- β⁺90%
- β⁺99.96%
- β⁺100%
- EC100%