At

Astatine-208m

Protons (Z)

85

Neutrons (N)

123

Mass number

208

Half-Life

1.5 µs

Abundance

---

Mass

207.989 u

Mass Excess

-10,194.0 keV

Spin

16-

Discovered

1991

Binding energy per nucleon

7,801 keV

Neutron separation energy

5,038 keV

Proton separation energy

337 keV

Decay Mode

γAstatine-208100%

Decay chain

Astatine-208Z 85 · N 1231.5 µs
γ100%
β⁺99.45%
α~100%