Fr
Francium-204m
Protons (Z)
87
Neutrons (N)
117
Mass number
204
Half-Life
2.41 s
Abundance
---
Mass
204.001 u
Mass Excess
658.0 keV
Spin
7+
Discovered
1967
Binding energy per nucleon
7,734 keV
Neutron separation energy
8,289 keV
Proton separation energy
447 keV
Decay Mode
Decay chain
- FrFrancium-204Z 87 · N 1172.41 s
- α90%
- α52%
- β⁺~100%
- β⁺~100%
- β⁺100%