Zirconium is a chemical element with the symbol Zr, atomic number 40 and atomic mass of 91.224. The name of zirconium is taken from the mineral zircon, the most important source of zirconium, and from the Persian word "zargun", meaning "gold colored". It is a lustrous, grey-white, strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion. Zirconium forms a variety of inorganic and organometallic compounds such as zirconium dioxide and zirconocene dichloride, respectively. Five isotopes occur naturally, three of which are stable. Zirconium compounds have no known biological role.Symbol: Zr
Atomic number: 40
Electron configuration: Kr 5s2 4d2
Melting point: 1,855 °C
Atomic mass: 91.224 ± 0.002 u
Discoverer: Martin Heinrich Klaproth