Chemical Elements History and Information Thallium

About the chemical element Thallium, its symbol, atomic number and weight, who discovered it and when.

The Atomic Elements and Their Uses

(Element) (Symbol) (Atomic number) (Atomic weight)

Thallium Tl 81 204.37

Discovered spectroscopically by Sir William Crookes of England, who isolated it in 1862. Independently isolated by Claude Lamy of France in 1862. Thallium sulfate is often used in rodent and insect poisons. Nevertheless, it is used to treat ringworm.