if the no. of electrons in chlorine is 17 then why its valency is 8

Chlorine has a valency of 1 not 8
As its electronic configuration is 2,8,7 and it needs 1 electron to complete its octet

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The valency of Chlorine (Cl) is 1. Its electronic configuration is 2,8,7 which is not inert and to achieve noble configuration it gains 1 electron and gets a configuration of 2,8,8
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