Question

(4) elements belonging to the same group
have the same valeney, give reason
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Answer 1

Answer:

The valency of an element is determined by the number of valence electron in the outermost shell of an atom of an element. (2) All the elements in a group have the same number of valence electrons. Therefore, elements in the same group should have the same valency. ... Similarly for group II, the valency is two.