Question

elements of group 1 and group 17 both have valency1

Answer 1

First of all, we know that valency is the combining capacity of any atom or the no. of electron require to complete the octet.

Hence the group 1 elements needs to donate 1 electron to achieve noble gas config.
similar group 17 elements need to take 1 electron to complete their octet and achieve noble gas configuration.

And hence they have the same valency.

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Answer 2

yes I verified. h has 1 as valency and cl also have 1 as valency