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Atomic symbol Tl
Atomic number 81
Classification Metals
Atomic mass 204.3833 amu
Other Information
Date of discovery 1861
Name of discoverer Sir William Crookes
Name origin From the Greek thallos, meaning a young shoot or green twig, due to the bright green line in its spectrum.
Uses Originally, its compounds were used in rat and ant poisons, but has been prohibited since 1975 in many countries. Also used for detecting infrared radiation and in heart muscle research.
Obtained from It is generally obtained as the by-product of zinc and lead smelting. Also found in iron pyrites, crookesite, hutchinsonite and lorandite.

Thallium is a soft poisonous metallic element. Its physical properties are similar to those of lead.[1]