Ac

Actinium-217

Protons (Z)

89

Neutrons (N)

128

Mass number

217

Half-Life

69.0 ns

Abundance

---

Mass

217.009 u

Mass Excess

8,702.0 keV

Spin

9/2-

Discovered

1972

Binding energy per nucleon

7,710 keV

Neutron separation energy

7,519 keV

Proton separation energy

1,878 keV

Decay Mode

Decay chain

Actinium-217Z 89 · N 12869.0 ns
α100%
α99.44%
β⁺96.1%
α99.546%
EC100%