Ra

Radium-225

Protons (Z)

88

Neutrons (N)

137

Mass number

225

Half-Life

14.82 d

Abundance

---

Mass

225.024 u

Mass Excess

21,993.0 keV

Spin

1/2+

Discovered

1947

Binding energy per nucleon

7,668 keV

Neutron separation energy

4,904 keV

Proton separation energy

7,045 keV

Decay Mode

β⁻Actinium-225100%

Decay chain

Radium-225Z 88 · N 13714.82 d
β⁻100%
α~100%
α~100%
α99.992%
β⁻97.91%
α100%
β⁻100%
α100%