Promethium
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Promethium is a chemical element, having the chemical symbol Pm.
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Its atomic number (the number of protons) is 61. It has a Standard Atomic Weight of (145), and is typically found as a solid in its elemental form.
Promethium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 3,000 °C , and a melting point of 1,042 °C .