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  2. Iron compounds - Wikipedia

    en.wikipedia.org/wiki/Iron_compounds

    The ferrous halides typically arise from treating iron metal with the corresponding hydrohalic acid to give the corresponding hydrated salts. [7] Fe + 2 HX → FeX 2 + H 2 (X = F, Cl, Br, I) Iron reacts with fluorine, chlorine, and bromine to give the corresponding ferric halides, ferric chloride being the most common. [13]

  3. Iron in biology - Wikipedia

    en.wikipedia.org/wiki/Iron_in_biology

    The most commonly known and studied bioinorganic iron compounds (biological iron molecules) are the heme proteins: examples are hemoglobin, myoglobin, and cytochrome P450. [1] These compounds participate in transporting gases, building enzymes, and transferring electrons. [5] Metalloproteins are a group of proteins with metal ion cofactors.

  4. Iron ore - Wikipedia

    en.wikipedia.org/wiki/Iron_ore

    Elemental iron is virtually absent on the Earth's surface except as iron-nickel alloys from meteorites and very rare forms of deep mantle xenoliths.Although iron is the fourth most abundant element in Earth's crust, composing about 5% by weight, [4] the vast majority is bound in silicate or, more rarely, carbonate minerals, and smelting pure iron from these minerals would require a prohibitive ...

  5. Ferrous - Wikipedia

    en.wikipedia.org/wiki/Ferrous

    The adjective ferrous or the prefix ferro-is often used to specify such compounds, as in ferrous chloride for iron(II) chloride (FeCl 2). The adjective ferric is used instead for iron(III) salts, containing the cation Fe 3+. The word ferrous is derived from the Latin word ferrum, meaning "iron".

  6. Excessive heavy metals found in many dark chocolate bars ...

    www.aol.com/news/heavy-metals-including-lead...

    Arora, who was not involved with the study, said that while the new research was strong, a big unknown with the paper is how the heavy metals got into the chocolate products in the first place.

  7. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Iron is the most widely used of all the metals, accounting for over 90% of worldwide metal production. Its low cost and high strength often make it the material of choice to withstand stress or transmit forces, such as the construction of machinery and machine tools , rails , automobiles , ship hulls , concrete reinforcing bars , and the load ...

  8. Cast iron - Wikipedia

    en.wikipedia.org/wiki/Cast_iron

    Grey cast iron is characterised by its graphitic microstructure, which causes fractures of the material to have a grey appearance. It is the most commonly used cast iron and the most widely used cast material based on weight. Most cast irons have a chemical composition of 2.5–4.0% carbon, 1–3% silicon, and the remainder iron.

  9. Biological roles of the elements - Wikipedia

    en.wikipedia.org/wiki/Biological_roles_of_the...

    Aluminum warrants special mention because it is the most abundant metal and the third most abundant element in the Earth's crust; [3] despite this, it is not essential for life. With this sole exception, the eight most highly abundant elements in the Earth's crust, making up over 90% of the crustal mass, [3] are also essential for life.