Rn

Radon-209

Protons (Z)

86

Neutrons (N)

123

Mass number

209

Half-Life

28.8 m

Abundance

---

Mass

208.99 u

Mass Excess

-8,941.0 keV

Spin

5/2-

Discovered

1952

Binding energy per nucleon

7,792 keV

Neutron separation energy

7,357 keV

Proton separation energy

3,760 keV

Decay Mode

Decay chain

Radon-209Z 86 · N 12328.8 m
β⁺83%
β⁺96.1%
α99.546%
EC100%