Fr

Francium-228m

Protons (Z)

87

Neutrons (N)

141

Mass number

228

Half-Life

3.0 m

Abundance

---

Mass

228.037 u

Mass Excess

34,390.0 keV

Spin

---

Discovered

2008

Binding energy per nucleon

7,622 keV

Neutron separation energy

3,363 keV

Proton separation energy

5,785 keV

Decay Mode

Decay chain

Francium-228Z 87 · N 1413.0 m
γ
β⁻100%
β⁻100%
β⁻100%
α~100%
α~100%
α100%
α100%
β⁻100%
β⁻64.046%
α100%