Fr

Francium-217

Protons (Z)

87

Neutrons (N)

130

Mass number

217

Half-Life

22.0 µs

Abundance

---

Mass

217.005 u

Mass Excess

4,315.0 keV

Spin

9/2-

Discovered

1968

Binding energy per nucleon

7,738 keV

Neutron separation energy

6,727 keV

Proton separation energy

3,227 keV

Decay Mode

αAstatine-213100%

Decay chain

Francium-217Z 87 · N 13022.0 µs
α100%
α100%
α100%