Ra

Radium-217

Protons (Z)

88

Neutrons (N)

129

Mass number

217

Half-Life

1.95 µs

Abundance

---

Mass

217.006 u

Mass Excess

5,890.0 keV

Spin

(9/2+)

Discovered

1970

Binding energy per nucleon

7,727 keV

Neutron separation energy

5,472 keV

Proton separation energy

4,370 keV

Decay Mode

αRadon-213100%

Decay chain

Radium-217Z 88 · N 1291.95 µs
α100%
α100%
α99.546%
EC100%