Thallium-204 (Tl-204)

Identity

Protons

81

Neutrons

123

Mass number

204

Mass

204.0 ± 1.2 u

Mass excess

-24.346 MeV

Spin

2-*

Stability

Half-life: 3.78 years

Natural occurrence

Not found in nature

Decays to

• beta minus 97.1 % → Pb-204