Question

Elements of group 1 and elements of group 17 both
have valency 1. Explain.​

Answer 1

Answer:

This is because elements of group 1 have 1 electron in valence shell so they can donate 1 electron whereas in group 17 elements have 7 electrons in valence shell so they can accept 1 electron.

Valency is the combining capacity of an element.

Hope it helps!

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Answer 2

Answer:

it is because group 1 element looses 1elctron whereas group 17 element accepts 1 electron