Pa

Protactinium-218m

Protons (Z)

91

Neutrons (N)

127

Mass number

218

Half-Life

150.0 µs

Abundance

---

Mass

218.02 u

Mass Excess

18,731.0 keV

Spin

(1-)

Discovered

1979

Binding energy per nucleon

7,659 keV

Neutron separation energy

6,395 keV

Proton separation energy

764 keV

Decay Mode

αActinium-214100%

Decay chain

Protactinium-218Z 91 · N 127150.0 µs
α100%
α93%
α71%
β⁺99.1%
β⁺94.55%
β⁺100%