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Elements belonging to the same group hav...

Elements belonging to the same group have the same valency.

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(i) Valency is the number of electrons donated, accepted or shared by the atoms of an element so as to complete the octet in the outermost orbit.
(ii) Valency is dependent upon the number of valence electrons present in the outermost shell of an atom called valence electrons.
(iii) Elements in the same group have same number of valence electrons, irrespective of the number of orbits. Hence, elements in the same group have the same valency.
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