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Vanadium is a chemical element with symbol V and atomic number 23. 
It occurs in nature as a white-to-grey metal compounds, and is often found as crystals. Pure vanadium has no smell. It usually combines with other elements such as oxygen, sodium, sulfur, or chloride.  Vanadium resists corrosion due to a protective film of oxide on the surface. Common oxidation states of vanadium include +2, +3, +4 and +5.  Vanadium and vanadium compounds can be found in the earth’s crust and in rocks, some iron ores, and crude petroleum deposits.