Explain how the valency varies in a period and group
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Valency remains constant down the group because all the elements in a group have same valency but along the period it first it increases up to 4 then decreases.
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Valency remains constant down the group because all the elements in a group have same valency but along the period it first it increases up to 4 then decreases.
# hope it helps
# Follow me
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