Answer:
Group number – 8
Step-by-step explanation:
To determine the charge on the ion formed by various elements, we simply consider their valence electrons.
However, this is only applicable to elements in group 1, 2 and 3 only.
To determine the charge on the ions formed by non metals i.e elements in group 4, 5, 6, 7 and 8(group 0) we simply subtract 8 from the group number i.e group number – 8
This can be further explained as follow:
Chlorine belong to group 7 because it has 7 valence electrons.
The charge on the chloride ion can be obtained as follow:
Group number = 7
Charge on ion =?
Charge on ion = Group number – 8
Charge on ion = 7 – 8
Charge on ion = – 1
Therefore, the charge on chloride ion is – 1.