Tl

Thallium-205m

Protons (Z)

81

Neutrons (N)

124

Mass number

205

Half-Life

2.6 µs

Abundance

---

Mass

204.978 u

Mass Excess

-20,530.2 keV

Spin

25/2+

Discovered

1976

Binding energy per nucleon

7,862 keV

Neutron separation energy

4,255 keV

Proton separation energy

3,129 keV

Decay Mode

γThallium-205100%

Decay chain

Thallium-205Z 81 · N 1242.6 µs
γ100%