Fr

Francium-215

Protons (Z)

87

Neutrons (N)

128

Mass number

215

Half-Life

90.0 ns

Abundance

---

Mass

215.0 u

Mass Excess

318.0 keV

Spin

9/2-

Discovered

1970

Binding energy per nucleon

7,753 keV

Neutron separation energy

6,795 keV

Proton separation energy

2,651 keV

Decay Mode

αAstatine-211100%

Decay chain

Francium-215Z 87 · N 12890.0 ns
α100%
EC58.2%
α100%