Answer:
Step-by-step explanation:
You'll have an idea of the positive or negative charge on the ion from the periodic table
For example Magnesium is in group 2 and its ionic charge is +2 Mg2+
In the higher groups the charge on the on is negative For example
Chlorine ion is Cl- (its in group 7 and it has (8-7) = 1 negative charge
