Tl

Thallium-199

Protons (Z)

81

Neutrons (N)

118

Mass number

199

Half-Life

7.42 h

Abundance

---

Mass

198.97 u

Mass Excess

-28,059.0 keV

Spin

1/2+

Discovered

1949

Binding energy per nucleon

7,894 keV

Neutron separation energy

8,601 keV

Proton separation energy

4,394 keV

Decay Mode

β⁺Mercury-199100%

Decay chain

Thallium-199Z 81 · N 1187.42 h
β⁺100%