Vanadium is a chemical element with the symbol 23. It is a hard, silvery-grey, malleable. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide) somewhat stabilizes the free metal against further oxidation.
Andrés Manuel del Río discovered compounds of vanadium in 1801 in Mexico -bearing mineral he called "brown lead". Though he initially presumed its qualities were due to the presence of a new element, he was later erroneously convinced by French chemist Hippolyte Victor Collet-Descotils that the element was just chromium. Then in 1830, Nils Gabriel Sefström of vanadium, thus proving there was a new element, and named it "vanadium" after the Scandinavian goddess of beauty and fertility, Vanadís (Freyja). The name was based on the wide range of colors found in vanadium compounds. Del Rio's lead mineral was ultimately named vanadinite for its vanadium content. In 1867 Henry Enfield Roscoe obtained the pure element.
Vanadium occurs naturally in about 65 minerals and in fossil fuel and Russia. Other countries produce it either from magnetite directly, flue dust of heavy oil, or as a byproduct of uranium alloys , and some aluminium alloys. The most important industrial vanadium compound, vanadium pentoxide , is used as a catalyst for the production of sulfuric acid. The vanadium redox battery for energy storage may be an important application in the future.
Large amounts of vanadium ions are found in a few organisms, possibly as a toxin. The oxide and some other salts of vanadium have moderate toxicity. Particularly in the ocean, vanadium is used by some life forms as an active center of enzymes , such as the vanadium bromoperoxidase.