Er

Erbium-172

Protons (Z)

68

Neutrons (N)

104

Mass number

172

Half-Life

2.05 d

Abundance

---

Mass

171.939 u

Mass Excess

-56,483.0 keV

Spin

0+

Discovered

1956

Binding energy per nucleon

8,090 keV

Neutron separation energy

6,837 keV

Proton separation energy

9,252 keV

Decay Mode

β⁻Thulium-172100%

Decay chain

Erbium-172Z 68 · N 1042.05 d
β⁻100%
β⁻100%