Fr

Francium-219

Protons (Z)

87

Neutrons (N)

132

Mass number

219

Half-Life

22.5 ms

Abundance

---

Mass

219.009 u

Mass Excess

8,617.0 keV

Spin

9/2-

Discovered

1948

Binding energy per nucleon

7,721 keV

Neutron separation energy

6,513 keV

Proton separation energy

3,889 keV

Decay Mode

αAstatine-215100%

Decay chain

Francium-219Z 87 · N 13222.5 ms
α100%
α100%
α~100%
β⁻100%