Er
Erbium-168
Protons (Z)
68
Neutrons (N)
100
Mass number
168
Half-Life
Stable
Abundance
26.978%
Mass
167.932 u
Mass Excess
-62,989.23 keV
Spin
0+
Discovered
1934
Binding energy per nucleon
8,130 keV
Neutron separation energy
7,771 keV
Proton separation energy
7,999 keV
Decay Mode
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