- You will have come across names like iron(II) sulphate and iron(III) chloride. The (II) and (III) are the oxidation states of the iron in the two compounds: +2 and +3 respectively. That tells you that they contain Fe2+ and Fe3+ ions.
Name of the compound FeCl2 Iron(II) chloride FeCl3 Iron (III) chloride MnO2 Manganese(IV) oxide Mn(NO3)2 Manganese (II) nitrate PbCl2 Lead(II) chloride
- Transition metals always show difference oxidation state as shown in the table below.
Fe +2, +3 Cu +1, +2 Mn +2, +4, +6, +7
- Non-metal elements (except fluorine) usually have more than one oxidation state.