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Zirconium is a chemical element with the chemical symbol Zr and an atomic number of 40. It is a silver white high melting point metal with a light gray color. Density 6.49 grams per cubic centimeter. Melting point 1852 ¡À 2 ¡æ, boiling point 4377 ¡æ. Valence+2,+3, and+4. The first ionization energy is 6.84 electron volts. Zirconium is prone to forming an oxide film on its surface, which has a glossy appearance similar to steel. Corrosion resistance, soluble in hydrofluoric acid and aqua regia; At high temperatures, it can react with non-metallic elements and many metallic elements to form solid solution compounds.