Why do elements belonging to the same group have the same valency?
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The valency of an element is determined by the number of valence electron in the outermost shell of an atom of an element. <br> (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. For example, the elements of group I contain only one valence electron, the valency of elements of group I is one. Similarly for group II, the valency is two.
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