Question

Can someone explain number three to me? i don’t need the answers i just don’t understand

Answer 1

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