Metallic chemical element, one of the transition elements, chemical symbol Fe, atomic number anemie zelezo Iron is the most used and cheapest metal, the second most abundant metal and fourth most abundant element in Earth's crust. It occurs rarely as a free metal, occasionally in natural alloys especially in meteorites and in hundreds of minerals and ores, including hematite, magnetite, limonite and anemie zelezo.
The human body contains about one-sixth of an ounce 4. Iron is ferromagnetic at ordinary temperatures anemie zelezo is the only metal that can be tempered.
Its uses bacterii rele steels of various types, as well as in cast and wrought iron collectively, "ferrous metals"are numerous. Alteration of its properties by impurities, especially carbon, is the basis of steelmaking.
Iron in compounds usually has valence 2 ferrous or 3 ferric. Ferrous and ferric oxides FeO and Fe2O3, respectively are used as pigments and the latter as jewelers' rouge. Rust is ferric oxide containing water; ferric oxide anemie zelezo widely used as a magnetic recording material in computer data-storage devices anemie zelezo magnetic tapes.
Ferrous and ferric sulfates anemie zelezo chlorides are all of industrial importance as mordants, reducing agents, flocculating agents, or raw materials and in inks and fertilizers.