chemicalelements.info

Thallium

81
Tl
Thallium
204.38

Properties

Symbol:Tl
Atomic Number:81
Atomic Weight:204.38
Density:11.8 g/cm3
Melting Point:
577K
304°C
579°F
Boiling Point:
1746K
1473°C
2683°F

Electron Shells

2, 8, 18, 32, 18, 3

Thallium (Tl) is a chemical element with atomic number 81. There are two stable thallium isotopes, 203Tl and 205Tl, of which 205Tl is the more abundant.

Thallium isn't found in pure form in nature. It is a very toxic element, and chemical compounds such as thallium sulfate (Tl2SO4) was previously used as rat poison.