Whats is rust (not the item that have to do next to planets but the one near metal) and how does it form.........?

Iron (III) oxide. Happens when iron is oxidized, generally by water.

3H2O + 2Fe = Fe2O3 + 3H2
Rust is a broad term for a series of iron oxides, usually red oxides, formed by the reaction of iron and oxygen contained by the presence of water or air moisture.
Rust consists of hydrated iron(III) oxides Fe2O3onH2O, iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3. Rusting is the adjectives term for corrosion of iron and its alloys, such as steel. Other metals undergo equivalent corrosion, but the resulting oxides are not commonly call rust.


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