Xe
Xenon-129
Protons (Z)
54
Neutrons (N)
75
Mass number
129
Half-Life
Stable
Abundance
26.401%
Mass
128.905 u
Mass Excess
-88,696.07 keV
Spin
1/2+
Discovered
1920
Binding energy per nucleon
8,431 keV
Neutron separation energy
6,907 keV
Proton separation energy
8,247 keV
Decay Mode
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