Cs
Caesium-133
Protons (Z)
55
Neutrons (N)
78
Mass number
133
Half-Life
Stable
Abundance
100%
Mass
132.905 u
Mass Excess
-88,070.943 keV
Spin
7/2+
Discovered
1921
Binding energy per nucleon
8,410 keV
Neutron separation energy
8,990 keV
Proton separation energy
6,081 keV
Decay Mode
---