hafnium

element 72

Hafnium

chemical element with symbol Hf and atomic number 72

Hf-crystal bar.jpg

Hf

Chemical element with atomic number 72 (Hf)

<span lang="en" dir="ltr"><span class="mw-page-title-main">Hafnium</span></span>

Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1922, by Dirk Coster and George de Hevesy. Hafnium is named after Hafnia, the Latin name for Copenhagen, where it was discovered. The element is obtained only by separation from zirconium, with most of the world's hafnium production coming from processes that also produce zirconium. These processes make use of heavy mineral sands ore deposits, which include the minerals zircon, rutile, and ilmenite, among others.

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1352185018

Hafnium

standard