Ra

Radium-209

Protons (Z)

88

Neutrons (N)

121

Mass number

209

Half-Life

4.71 s

Abundance

---

Mass

209.002 u

Mass Excess

1,858.0 keV

Spin

5/2-

Discovered

1967

Binding energy per nucleon

7,733 keV

Neutron separation energy

7,941 keV

Proton separation energy

2,766 keV

Decay Mode

Decay chain

Radium-209Z 88 · N 1214.71 s
α100%
β⁺75.4%
β⁺90%
β⁺99.96%
β⁺100%
EC100%