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[ ? ] Transition metal:
Silvery-white, very hard metal.

Molybdenum is a chemical element, having the chemical symbol Zr. Its atomic number (the number of protons) is 42. It has a standard atomic weight of 95.94 g•mol −1 and is a solid in its elemental form.

Molybdenum is considered to be a member of the "Transition metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 4,639 °C and a melting point of 2,623 °C.