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From Citizendium, the Citizens' Compendium

Lithium is a chemical element, having the chemical symbol Li. Its atomic number (number of protons) is 3. It has a Standard Atomic Weight of 6.941, and is typically found as a solid in its elemental form. Lithium is considered to be a member of the "Alkali Metal" family of elements, and has a boiling point of 1342°C.