Fr
Francium-205
Protons (Z)
87
Neutrons (N)
118
Mass number
205
Half-Life
3.9 s
Abundance
---
Mass
204.999 u
Mass Excess
-1,310.0 keV
Spin
9/2-
Discovered
1964
Binding energy per nucleon
7,746 keV
Neutron separation energy
9,988 keV
Proton separation energy
629 keV
Decay Mode
Decay chain
- FrFrancium-205Z 87 · N 1183.9 s
- α98.5%
- α71%
- β⁺100%
- β⁺100%
- β⁺100%
- EC100%