Thallium
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Thallium is a chemical element, having the chemical symbol Tl.
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Its atomic number (the number of protons) is 81. It has a Standard Atomic Weight of 204.3833(2), and is typically found as a solid in its elemental form.
Thallium is considered to be a member of the "Post-Transition Metal" class of elements, has a boiling point of 1,473 °C, and a melting point of 304 °C.