Final answer:
The charge on the permanganate ion is -1.
Step-by-step explanation:
The charge on the permanganate ion is -1. This is because the permanganate ion (MnO4) has a charge of -1. The charge on the ion is determined by the oxidation states of the atoms involved. In the permanganate ion, the manganese (Mn) atom has an oxidation state of +7, while each oxygen (O) atom has an oxidation state of -2. Since there are four oxygen atoms, the total oxidation state contributed by oxygen is -8. Therefore, the remaining charge of -1 is attributed to the manganese atom, resulting in a charge of -1 on the permanganate ion.