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[ ? ] Lanthanide:
Soft, silvery, malleable, and ductile metal.

Praseodymium is a chemical element, having the chemical symbol Pr. Its atomic number (the number of protons) is 59. It has a standard atomic weight of 140.9077 g•mol −1 and is a solid in its elemental form.

Praseodymium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,520 °C and a melting point of 931 °C.