Pm

Promethium-135

Protons (Z)

61

Neutrons (N)

74

Mass number

135

Half-Life

49.0 s

Abundance

---

Mass

134.925 u

Mass Excess

-70,060.0 keV

Spin

(3/2+)

Discovered

1975

Binding energy per nucleon

8,237 keV

Neutron separation energy

11,371 keV

Proton separation energy

1,703 keV

Decay Mode

β⁺Neodymium-135100%

Decay chain

Promethium-135Z 61 · N 7449.0 s
β⁺100%
β⁺100%
β⁺100%
β⁺100%
β⁺100%