Question = How to find valency of chlorine
Answer Chlorine valency is 1 because chlorine belong to overall group 17 or subgroup 7A
it means that 7 electron are present in outermost shell of chlorine
if outermost valence is greater than 4
then the following formula is used for finding valency
8-valence electron = 0
8-7=1
so it proves valency of chlorine is +1
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