Tl
Thallium-203
Protons (Z)
81
Neutrons (N)
122
Mass number
203
Half-Life
Stable
Abundance
29.515%
Mass
202.972 u
Mass Excess
-25,761.3 keV
Spin
1/2+
Discovered
1931
Binding energy per nucleon
7,886 keV
Neutron separation energy
7,852 keV
Proton separation energy
5,705 keV
Decay Mode
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