Protactinium
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Protactinium is a chemical element, having the chemical symbol Pa.
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Its atomic number (the number of protons) is 91. It has a Standard Atomic Weight of 231.03588(2), and is typically found as a solid in its elemental form.
Protactinium is considered to be a member of the "Actinide" class of elements, has a boiling point of ~4,000 °C , and a melting point of 1,572 °C .