Zirconium
From Citizendium, the Citizens' Compendium
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Zirconium is a chemical element, having the chemical symbol Zr. Its atomic number (the number of protons) is 40. It has a Standard Atomic Weight of 91.22, and is typically found as a solid in its elemental form.
Zirconium is considered to be a member of the "Transition Metal" family of elements, and has a boiling point of 4409°C.

