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It is a metal that belongs to the first transition series and group 8 of the periodic table. It is by mass the most common element on Earthright in front of oxygen It is the fourth most common element in the Earth's crust.
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In its metallic state, iron is rare in the Earth's crustlimited mainly to deposition by meteorites. Humans started to master that process in Eurasia by about BCE, [ not verified in body ] and the use of iron tools and weapons began to displace copper alloysin some regions, only around BCE. That event is considered the transition iawed the Questkons Age to the Iron Age. In the modern worldiron alloys, such as steelstainless steelcast iron and special steels are by far the most common industrial metals, because of their mechanical properties and low cost. Pristine and iron jawed angels questions pure iron surfaces are mirror-like silvery-gray. However, iron reacts readily iron jawed angels questions oxygen and water to give brown to black hydrated iron oxidescommonly known as rust.
Unlike the oxides of some other metals, that form passivating layers, rust occupies more volume than the metal and thus flakes off, exposing fresh surfaces for corrosion.
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The body of an adult human contains about 4 grams 0. These two proteins play essential roles in vertebrate metabolismrespectively oxygen transport by blood and oxygen storage in muscles.
To maintain the necessary levels, human iron metabolism requires a minimum of iron in the diet. Iron is also the metal at the active site of many important redox enzymes dealing with cellular respiration and oxidation and reduction in plants and animals.
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Iron shares many properties of other transition metalsincluding the other group 8 elementsruthenium and osmium. Iron also forms many coordination compounds ; some of them, such as ferroceneferrioxalateand Prussian bluehave iron jawed angels questions industrial, medical, or research applications.
The first three forms are observed at ordinary pressures. The physical properties of iron at very high pressures and temperatures have also been studied extensively, [7] [8] because of their relevance to theories about the cores of the Earth and other planets. It is supposed to have an orthorhombic or a double hcp structure.
The melting and boiling points of iron, along with its enthalpy of atomizationare lower than those of the earlier 3d elements from scandium to chromiumshowing the lessened contribution of the 3d electrons to metallic bonding as they are attracted more and more into the inert core by the nucleus; [11] iron jawed angels questions, they are higher than the values for the previous element manganese because that element has a half-filled 3d subshell and consequently its d-electrons are not easily delocalized.]
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