why do elemnts in a group show same valency
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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. ... These elements also have similar physical and chemical properties.
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They show same valency because their no.of valence electrons s the same
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