MnO Mn2+ and O2- = Mn2O2 but you'd simplify and it becomes MnO
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Actually, there are no compounds of magnesium with oxidation number 4. If we assume about a hypothetical compound, the formula will be identical as to magnesium peroxide.
The II tells you that manganese is in the +2 oxidation state. Oxygen is always -2 so the formula is MnO
The formula for manganese(VI) sulfide is MnS3.
The name for the formula Mn2O5 is Manganese(V) oxide.
The empirical formula for manganese oxide is MnO.
The formula for sulphur vi oxide is SO3.
The chemical formula for manganese VII oxide is Mn2O7.