Ra

Radium-208m

Protons (Z)

88

Neutrons (N)

120

Mass number

208

Half-Life

263.0 ns

Abundance

---

Mass

208.004 u

Mass Excess

3,875.0 keV

Spin

(8+)

Discovered

1998

Binding energy per nucleon

7,722 keV

Neutron separation energy

7,706 keV

Proton separation energy

565 keV

Decay Mode

γRadium-208100%

Decay chain

Radium-208Z 88 · N 120263.0 ns
γ100%
α87%
α72.4%
β⁺88.9%
β⁺100%
EC100%
β⁺100%