Thorium
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Thorium is a chemical element, having the chemical symbol Th.
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Its atomic number (the number of protons) is 90. It has a Standard Atomic Weight of 232.0381(1), and is typically found as a solid in its elemental form.
Thorium is considered to be a member of the "Actinide" class of elements, has a boiling point of 4,788 °C , and a melting point of 1,750 °C .