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Chemical We Use

Ferrous in non-chemical contexts is a general adjective for iron. For example, referring to "ferrous metallurgy" includes the production of metallic iron, including wrought iron (commercially pure iron, with less than 0.2% carbon), cast iron (with 3.5-5% carbon), steel (with a carbon content between them), or other alloying elements.

Iron is believed to be the tenth most abundant element in the universe, and the fourth most abundant in the Earth's crust. The concentration of iron in the various layers in the structure of the Earth ranges from high (probably greater than 80%, perhaps even a nearly pure iron crystal) at the inner core, to only 5% in the outer crust. Iron is second in abundance to aluminium among the metals and fourth in abundance in the crust. Iron is the most abundant element by mass of our entire planet, making up 35% of the mass of the Earth as a whole.

Ferric is a term that means containing or having to do with iron, derived from the Latin word ferrum, meaning "iron". In chemistry the term is reserved for iron with an oxidation number of +3, denoted iron(III) or Fe3+, whereas ferrous indicates that it has oxidation number of +2, denoted iron(II) or Fe2+, which combine with other atoms to form molecules.