what is Iron II and iron III
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iron(II, III) oxide is the chemical compound with formula Fe₃O₄. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide, which is rare, and iron(III) oxide also known as hematite.
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The numbers written after iron that is 2 or 3 represents the valencies means iron has 2 valencies one is 2 and other is 3....
Iron with valency 2 is called ferrous
Iron with valency 3 is called ferric
Iron with valency 2 is called ferrous
Iron with valency 3 is called ferric
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