Er
Erbium-164
Protons (Z)
68
Neutrons (N)
96
Mass number
164
Half-Life
Stable
Abundance
1.601%
Mass
163.929 u
Mass Excess
-65,942.6 keV
Spin
0+
Discovered
1938
Binding energy per nucleon
8,149 keV
Neutron separation energy
8,847 keV
Proton separation energy
6,854 keV
Decay Mode
- α→Dysprosium-160
- β⁺