Erbium-169 (Er-169)

Identity

Protons

68

Neutrons

101

Mass number

169

Mass

168.93 ± 0.33 u

Mass excess

-60.921 MeV

Spin

1/2-*

Stability

Half-life: 9.39 days

Natural occurrence

Not found in nature

Decays to

• beta minus → Tm-169