Fr

Francium-225

Protons (Z)

87

Neutrons (N)

138

Mass number

225

Half-Life

3.95 m

Abundance

---

Mass

225.026 u

Mass Excess

23,821.0 keV

Spin

3/2-

Discovered

1969

Binding energy per nucleon

7,663 keV

Neutron separation energy

5,999 keV

Proton separation energy

5,913 keV

Decay Mode

β⁻Radium-225100%

Decay chain

Francium-225Z 87 · N 1383.95 m
β⁻100%
β⁻100%
α~100%
α~100%
α99.992%
β⁻97.91%
α100%
β⁻100%
α100%