If homework has cation with more than one charge that are NOT included in the above ones you need to memorize, then look in this link Cations with More than One Charge.
2021-2022 Cations with More than One Charge to Memorize
Copper (I) ion, Cu1+
Copper (II) ion, Cu2+
Lead (II) ion, Pb2+
Lead (IV) ion, Pb4+
Tin (II) ion, Sn2+
Tin (IV) ion, Sn4+
Chromium (II) ion, Cr2+
Chromium (III)ion, Cr3+
Iron (II) ion, Fe2+
Iron (III) ion, Fe3+
D block Elements that have only one Charge (Ion)
Silver ion, Ag1+
Zinc ion, Zn2+
Nickel ion, Ni2+
If homework has cation with more than one charge that are NOT included in the above ones you need to memorize, then look in this link Cations with More than One Charge.