Should I say iron oxide.. or ferric oxide?

Question

I prefer using the ferric oxide method because you can distinguish the charge between each of the different ions, ferric is with +2 charge and ferris oxide I think is with a +1 charge. But I have not heard ferric oxide being heard very much except for my science book so which one do you think is correct

Answer 1

First lets make some corrections. In Ferric Oxide the Iron has a +3 charge and in Ferrous (not ferris) Oxide the Iron has a +2 charge. Now you can use this method but if you want to use the other method then you wouldn't call both of them simply Iron Oxide. Ferric Oxide is Iron(III) Oxide and Ferrous Oxide is Iron(II) Oxide. The roman numerals denote the charge of the iron.

To answer the additional questions:

The oxygen still takes 2 electrons like expected there are just more ions in the compound. In Iron(III) Oxide the formula is Fe2O3. In Iron(II) Oxide the formula is FeO as you probably knew. And yes you literally say Iron three oxide.

Answer 2

Ferrous oxide +2

Ferric oxide +3

iron oxide[II] +2

iron oxide[III] +3