Fr

Francium-216m

Protons (Z)

87

Neutrons (N)

129

Mass number

216

Half-Life

850.0 ns

Abundance

---

Mass

216.003 u

Mass Excess

3,190.0 keV

Spin

(9-)

Discovered

2007

Binding energy per nucleon

7,741 keV

Neutron separation energy

5,199 keV

Proton separation energy

2,930 keV

Decay Mode

Decay chain

Francium-216Z 87 · N 129850.0 ns
α100%
α100%
β⁺100%