Cerium
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Cerium is a chemical element, having the chemical symbol Ce.
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Its atomic number (the number of protons) is 58. It has a Standard Atomic Weight of 140.116(1), and is typically found as a solid in its elemental form.
Cerium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 3,443 °C , and a melting point of 798 °C .