Editing Period 5 element (section)

===Zirconium===

{{main|Zirconium}}

'''Zirconium''' is a [[chemical element]] with the symbol '''Zr''' and [[atomic number]] 40. The name of zirconium is taken from the mineral ''[[zircon]]''.  Its atomic mass is 91.224. It is a lustrous, gray-white, strong [[transition metal]] that resembles [[titanium]]. Zirconium is mainly used as a [[refractory]] and [[opacifier]], although minor amounts are used as alloying agent for its strong resistance to corrosion. Zirconium is obtained mainly from the mineral [[zircon]], which is the most important form of zirconium in use.

Zirconium forms a variety of [[inorganic chemistry|inorganic]] and [[organometallic compounds]] such as [[zirconium dioxide]] and [[zirconocene dichloride]], respectively. Five [[isotope]]s occur naturally, three of which are stable. Zirconium compounds have no biological role.