Ra

Radium-209m

Protons (Z)

88

Neutrons (N)

121

Mass number

209

Half-Life

117.0 µs

Abundance

---

Mass

209.003 u

Mass Excess

2,740.0 keV

Spin

13/2+

Discovered

2008

Binding energy per nucleon

7,729 keV

Neutron separation energy

7,059 keV

Proton separation energy

1,884 keV

Decay Mode

Decay chain

Radium-209Z 88 · N 121117.0 µs
α90%
β⁺75.4%
β⁺90%
β⁺99.96%
β⁺100%
EC100%