Terbium-157 (Tb-157)

Identity

Protons

65

Neutrons

92

Mass number

157

Mass

156.9 ± 1.1 u

Mass excess

-70.764 MeV

Spin

3/2+

Stability

Half-life: 71 years

Natural occurrence

Not found in nature

Decays to

• electron capture → Gd-157