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Key People:William KellyGeorgina hope RinehartJamsetji TataLangley George HancockAbraham Darby...(Show more)Related Topics:FerroalloyGamma ironBeta ironAlpha ironFerrous stole compound...(Show more)

Iron (Fe), chemical element, metal of team 8 (VIIIb) the the regular table, the most-used and cheapest metal.


Element Propertiesatomic numberatomic weightmelting pointboiling pointspecific gravityoxidation stateselectron configuration
26
55.847
1,538 °C (2,800 °F)
3,000 °C (5,432 °F)
7.86 (20 °C)
+2, +3, +4, +6
3d64s2

Occurrence, uses, and properties

Iron makes up 5 percent of earth’s crust and is 2nd in abundance to aluminum among the metals and fourth in variety behind oxygen, silicon, and aluminum amongst the elements. Iron, which is the chief ingredient of earth’s core, is the most abundant aspect in earth as a entirety (about 35 percent) and also is reasonably plentiful in the Sun and also other stars. In the tardy the totally free metal is rare, developing as terrestrial iron (alloyed v 2–3 percent nickel) in basaltic rocks in Greenland and carbonaceous sediments in the United claims (Missouri) and as a low-nickel meteoric stole (5–7 percent nickel), kamacite. Nickel-iron, a aboriginal alloy, occurs in terrestrial deposits (21–64 percent iron, 77–34 percent nickel) and also in meteorites together taenite (62–75 percent iron, 37–24 percent nickel). (For mineralogical nature of native iron and nickel-iron, see native elements .) Meteorites space classified together iron, iron-stone, or stony according to the loved one proportion of their iron and also silicate-mineral content. Steel is also found linked with other facets in numerous minerals; of biggest importance together iron ore space hematite (ferric oxide, Fe2O3), magnetite (triiron tetroxide, Fe3O4), limonite (hydrated ferric oxide hydroxide, FeO(OH)∙nH2O), and also siderite (ferrous carbonate, FeCO3). Igneous rocks average about 5 percent steel content. The steel is extract by smelting through carbon (coke) and limestone. (For certain information ~ above the mining and production of iron, see steel processing.)


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steel ore country mine production 2006 (metric tons)* % of world mine manufacturing demonstrated reserves 2006 (metric tons)*, ** % of people demonstrated to make reservation
*Estimated.
**Iron content.
***Detail does not add to full given since of rounding.
Source: U.S. Room of the Interior, Mineral Commodity recaps 2007.
China 520,000,000 30.8 15,000,000,000 8.3
Brazil 300,000,000 17.8 41,000,000,000 22.8
Australia 270,000,000 16.0 25,000,000,000 13.9
India 150,000,000 8.9 6,200,000,000 3.4
Russia 105,000,000 6.2 31,000,000,000 17.2
Ukraine 73,000,000 4.3 20,000,000,000 11.1
United states 54,000,000 3.2 4,600,000,000 2.6
southern Africa 40,000,000 2.4 1,500,000,000 0.8
Canada 33,000,000 2.0 2,500,000,000 1.4
Sweden 24,000,000 1.4 5,000,000,000 2.8
Iran 20,000,000 1.2 1,500,000,000 0.8
Venezuela 20,000,000 1.2 3,600,000,000 2.0
Kazakhstan 15,000,000 0.9 7,400,000,000 4.1
Mauritania 11,000,000 0.7 1,000,000,000 0.6
Mexico 13,000,000 0.8 900,000,000 0.5
other countries 43,000,000 2.5 17,000,000,000 9.4
people total 1,690,000,000 100*** 180,000,000,000 100***

The median quantity of steel in the person body is around 4.5 grams (about 0.004 percent), the which approximately 65 percent is in the form of hemoglobin, i m sorry transports molecular oxygen from the lungs throughout the body; 1 percent in the various enzymes that manage intracellular oxidation; and most that the rest stored in the body (liver, spleen, bone marrow) for future conversion come hemoglobin. Red meat, egg yolk, carrots, fruit, whole wheat, and also green vegetables contribute most of the 10–20 milligrams of iron forced each work by the typical adult. For the treatment of hypochromic anemias (caused by stole deficiency), any of a huge number of essential or inorganic iron (usually ferrous) compounds room used.

Iron, as commonly available, nearly always contains small amounts of carbon, which are picked up from the coke during smelting. These modify its properties, indigenous hard and brittle actors irons containing up to 4 percent carbon to more malleable low-carbon steels containing less than 0.1 percent carbon.


Three true allotropes of stole in that is pure form occur. Delta iron, defined by a body-centred cubic decision structure, is stable above a temperature that 1,390 °C (2,534 °F). Below this temperature over there is a change to gamma iron, which has actually a face-centred cubic (or cubic close-packed) structure and is paramagnetic (capable the being only weakly magnetized and also only as lengthy as the magnetizing field is present); its ability to form solid options with carbon is crucial in steelmaking. In ~ 910 °C (1,670 °F) over there is a transition to paramagnetic alpha iron, which is additionally body-centred cubic in structure. Below 773 °C (1,423 °F), alpha iron becomes ferromagnetic (i.e., capable of gift permanently magnetized), describe a change in electronic structure however no adjust in decision structure. Above 773 °C (its Curie point), it loser its ferromagnetism altogether. Alpha steel is a soft, ductile, lustrous, gray-white metal of high tensile strength.

Pure steel is quite reactive. In a very carefully divided state metallic iron is pyrophoric (i.e., it ignites spontaneously). It combine vigorously through chlorine ~ above mild heater and likewise with a selection of other nonmetals, including all of the halogens, sulfur, phosphorus, boron, carbon, and also silicon (the carbide and silicide phases play major roles in the technological metallurgy that iron). Metallic iron dissolves easily in dilute mineral acids. Through nonoxidizing acids and in the lack of air, iron in the +2 oxidation state is obtained. With air existing or when heat dilute nitric mountain is used, several of the steel goes into solution as the Fe3+ ion. An extremely strongly oxidizing mediums—for example, concentrated nitric acid or mountain containing dichromate—passivate steel (i.e., reason it to lose its typical chemical activity), however, lot as they perform chromium. Air-free water and dilute air-free hydroxides have little effect on the metal, yet it is attacked by hot concentrated sodium hydroxide.

Natural iron is a mixture of 4 stable isotopes: iron-56 (91.66 percent), iron-54 (5.82 percent), iron-57 (2.19 percent), and iron-58 (0.33 percent).

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Iron compounds space amenable to examine by taking advantage of a phenomenon known as the Mössbauer effect (the phenomenon that a gamma ray being took in and reradiated by a nucleus without recoil). Return the Mössbauer result has to be observed for around one-third that the elements, that is an especially for steel (and come a lesser degree tin) the the impact has to be a major research device for the chemist. In the case of iron the result depends ~ above the truth that the nucleus of iron-57 deserve to be excited come a high power state by the absorption of gamma radiation of really sharply identified frequency that is affected by the oxidation state, electron configuration, and chemical environment of the iron atom and can hence be used as a probe the its chemical behaviour. The marked Mössbauer effect of iron-57 has been provided in studying magnetism and hemoglobin derivatives and also for make a very an accurate nuclear clock.