The systematic name of the compound Fe2O3 is Iron(III) oxide.
This name is derived from the oxidation state of iron in the compound. In Fe2O3, there are two iron (Fe) atoms and three oxygen (O) atoms. Since the compound is neutral overall, the total positive charge from the iron must balance the total negative charge from the oxygen. Each oxygen has a charge of -2, contributing a total of -6. Therefore, to balance this, the two iron atoms must have a total charge of +6, which means each iron atom must be in the +3 oxidation state. Thus, we represent this as Iron(III) oxide, indicating that iron has a +3 charge in this compound.