Fr
Francium-199
Protons (Z)
87
Neutrons (N)
112
Mass number
199
Half-Life
6.6 ms
Abundance
---
Mass
199.007 u
Mass Excess
6,771.0 keV
Spin
(1/2+)
Discovered
1999
Binding energy per nucleon
7,695 keV
Neutron separation energy
10,880 keV
Proton separation energy
-712 keV
Decay Mode
Decay chain
- FrFrancium-199Z 87 · N 1126.6 ms
- α100%
- α100%
- α51%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%
- β⁺100%