Erbium-172 (Er-172)

Identity

Protons

68

Neutrons

104

Mass number

172

Mass

171.9 ± 4.3 u

Mass excess

-56.483 MeV

Spin

0+

Stability

Half-life: 2.05 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Tm-172