Mercury only has a two and one oxidation state. HgO would be the formula for mercury II oxide.
Phosphorus(III) oxide has the formula P2O3 but it exists as the molecule of P4O6
Formula of 3 types of Iron oxides: Iron(II) oxide= FeO Iron(III) oxide= Fe2O3 Iron(II,III) oxide= Fe3O4
Iron II oxide: FeO Iron III oxide: Fe2O3
HgO
HgO
FeO for ferrous oxide, ( iron(II) oxide); Fe2O3 for ferric oxide, (iron(III) oxide) and Fe3O4 for ferrous ferric oxide, (iron (II,III) oxide)
Phosphorus(III) oxide has the formula P2O3 but it exists as the molecule of P4O6
Nickel(II) Oxide = NiO Nickel(III) Oxide= Ni2O3
Fe(III) oxide formula: Fe2O3
Nickel(II) Oxide = NiO Nickel(III) Oxide= Ni2O3
The formula is Ti2O3
Formula: Au2O3
HgO
Mercuric oxide or mercury (II) oxide : HgO
Formula of 3 types of Iron oxides: Iron(II) oxide= FeO Iron(III) oxide= Fe2O3 Iron(II,III) oxide= Fe3O4
Fe2O3 or iron(iii) oxide
Gold(III)Oxide is Au2O3