Fr

Francium-228

Protons (Z)

87

Neutrons (N)

141

Mass number

228

Half-Life

38.0 s

Abundance

---

Mass

228.036 u

Mass Excess

33,384.0 keV

Spin

2-

Discovered

1972

Binding energy per nucleon

7,626 keV

Neutron separation energy

4,369 keV

Proton separation energy

6,791 keV

Decay Mode

β⁻Radium-228100%

Decay chain

Francium-228Z 87 · N 14138.0 s
β⁻100%
β⁻100%
β⁻100%
α~100%
α~100%
α100%
α100%
β⁻100%
β⁻64.046%
α100%