At

Astatine-209m

Protons (Z)

85

Neutrons (N)

124

Mass number

209

Half-Life

916.0 ns

Abundance

---

Mass

208.989 u

Mass Excess

-10,455.0 keV

Spin

29/2+

Discovered

1975

Binding energy per nucleon

7,803 keV

Neutron separation energy

6,056 keV

Proton separation energy

275 keV

Decay Mode

γAstatine-209100%

Decay chain

Astatine-209Z 85 · N 124916.0 ns
γ100%
β⁺96.1%
α99.546%
EC100%