It is by mass the most common element on Earth, forming much of Earth's outer and inner core.
A human male of average height has about 4 grams of iron in his body, a female about 3.5 grams.
This iron is distributed throughout the body in hemoglobin, tissues, muscles, bone marrow, blood proteins, enzymes, ferritin, hemosiderin, and transport in plasma.
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Fresh iron surfaces appear lustrous silvery-gray, but oxidize in normal air to give hydrated iron oxides, commonly known as rust.
Unlike the metals that form passivating oxide layers, iron oxides occupy more volume than the metal and thus flake off, exposing fresh surfaces for corrosion.Iron plays an important role in biology, forming complexes with molecular oxygen in hemoglobin and myoglobin; these two compounds are common oxygen transport proteins in vertebrates.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.Like the other group 8 elements, ruthenium and osmium, iron exists in a wide range of oxidation states, −2 to 7, although 2 and 3 are the most common.Elemental iron occurs in meteoroids and other low oxygen environments, but is reactive to oxygen and water.Leave us a 5* review :*Thoughts - I am a celebrity who lives in a small town, so you could say that it is difficult to find someone who doesn't know about me in my immediate area. Thanks to this, I was able to expand my search to places where I am virtually unknown and avoid all the golddiggers!