Symbol, Chemistry.
- thallium.
- target language.
- trade-last.
- truckload.
- (in Turkey) lira; liras.
- Also t.l. trade-last.
- trade list.
- time loan.
the chemical symbol for
- thallium
- The symbol for the elementthallium
- The symbol for thallium.
Tl
- A soft, malleable, very poisonous metallic element that is used in photography, in making low-melting and highly refractive glass, and in treating skin infections. Atomic number 81; atomic weight 204.38; melting point 303.5°C; boiling point 1,457°C; specific gravity 11.85; valence 1, 3. See Periodic Table.