*give scientific reasons. 1 Elements belonging to the same group have the same valency.
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Explanation:
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.
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Answer:
because their shells are not fully filled so they losse or gain electon to become a stable atom
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