Question

element of group 1 and element of group 17 both have valancy 1 Explain?

Answer 1

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.Elements of group 1 and group 17, bothare univalent (both have valency 1).
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