Tl

Thallium-205

Protons (Z)

81

Neutrons (N)

124

Mass number

205

Half-Life

Stable

Abundance

70.485%

Mass

204.974 u

Mass Excess

-23,820.8 keV

Spin

1/2+

Discovered

1931

Binding energy per nucleon

7,878 keV

Neutron separation energy

7,546 keV

Proton separation energy

6,420 keV

Decay Mode

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