You're probably talking about compound ions. You don't get a sheet in the exam but they're not hard to learn.
The only ones you should need to know are these:
Ammonium - NH4 +
Hydroxide - OH -
Nitrate - NO3 -
Sulphate - SO4 2-
Carbonate - CO3 2-
Phosphate - PO4 3-
Hydrogen Carbonate - HCO3 -