Fr
Francium-203m
Protons (Z)
87
Neutrons (N)
116
Mass number
203
Half-Life
43.0 ms
Abundance
---
Mass
203.001 u
Mass Excess
1,237.0 keV
Spin
1/2+
Discovered
2013
Binding energy per nucleon
7,730 keV
Neutron separation energy
9,936 keV
Proton separation energy
-223 keV
Decay Mode
Decay chain
- FrFrancium-203Z 87 · N 11643.0 ms
- γ80%
- α100%
- α89%
- β⁺~100%
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%