Question

Elements of group 1 and group 17both have valency 1

Answer 1

No, the elements in group 1 have the valency of 1

And, in group 17 elements have valency of 7.

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Answer 2

Elements in group 1 has only 1 electron in the outermost shell and hence they they lose one electron to attain a stable configuration ,hence their valency is 1. where where is elements in group 17 have 7 electrons in their outermost shell, so they gain one electron to attain a stable configuration, hence their valency is also one.

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