Po

Polonium-209m

Protons (Z)

84

Neutrons (N)

125

Mass number

209

Half-Life

119.0 ns

Abundance

---

Mass

208.987 u

Mass Excess

-12,100.6 keV

Spin

31/2-

Discovered

1974

Binding energy per nucleon

7,815 keV

Neutron separation energy

2,703 keV

Proton separation energy

519 keV

Decay Mode

γPolonium-209100%

Decay chain

Polonium-209Z 84 · N 125119.0 ns
γ100%
α99.546%
EC100%