Zirconium is a chemical element, its chemical symbol is Zr, its atomic number is 40, it is a high melting point metal, light gray. The density is 6.49g/cm3. Melting point 1852 ± 2.001 ℃, boiling point 4377 ℃. Valence + 2, + 3 and + 4. The first ionization energy is 6.84 ev. The surface of zirconium is easy to form a layer of oxide film with luster, so its appearance is similar to that of steel. It is corrosion-resistant and soluble in hydrofluoric acid and aqua regia. At high temperature, it can react with non-metallic elements and many metal elements to form solid solution compounds.
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