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Gadolinium is a chemical element, having the chemical symbol Gd. Its atomic number (the number of protons) is 64. It has a standard atomic weight of 157.25 g•mol −1 and is a solid in its elemental form.
Gadolinium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,273 °C and a melting point of 1,313 °C.