why is silicon tetravalent while chlorine is monovalent
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Valency of Cl= 8-7=1, hence its valency is 1. ... Thus the valency of both Si and Cl is as per the rules.
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silicon belongs to group 14 and it has 4 electrons in it's valance shell. Thus, it can attain a stable configuration by sharing, gaining or by loosing four electrons. So, silicon is called tetravalent. Chlorine belongs to group 17 and it has 7 electrons in it's valance shell. It can attain a stable configuration by gaining one electron. So, chlorine is called monovalent
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