Elements belonging to the same group have the same valency.​

Explanation:

Elements in same group show same valency because they have same number of electrons in ther outermost shell i.e. Valence shell. Since valency depends upon the valence electrons so they have same valency. Elements in the same group have same valancy.

The valency of an element is determined by the number of valence electron in the outermost shell of an atom of an element

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