Promethium-151 (Pm-151)

Identity

Protons

61

Neutrons

90

Mass number

151

Mass

150.9 ± 4.9 u

Mass excess

-73.386 MeV

Spin

5/2+*

Stability

Half-life: 1.18 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Sm-151