Iron Oxide

Its actually Iron(ii) Oxide there is no such thing as iron oxide.

Rust is not an element but compounds of iron. The brown oxide of iron is ferrous oxide and the black oxide of iron is ferric oxide.

FeO for ferrous oxide, ( iron(II) oxide); Fe2O3 for ferric oxide, (iron(III) oxide) and

Fe3O4 for ferrous ferric oxide, (iron (II,III) oxide)

No, iron oxide is a solid.

We know that iron (Fe) and oxygen (O) make up iron oxide. (There is more than one oxide of iron, by the way.)