Pm

Promethium-140

Protons (Z)

61

Neutrons (N)

79

Mass number

140

Half-Life

9.2 s

Abundance

---

Mass

139.916 u

Mass Excess

-78,212.0 keV

Spin

1+

Discovered

1966

Binding energy per nucleon

8,289 keV

Neutron separation energy

8,782 keV

Proton separation energy

3,484 keV

Decay Mode

β⁺Neodymium-140100%

Decay chain

Promethium-140Z 61 · N 799.2 s
β⁺100%
EC100%
β⁺100%