Question

In any period, the valency of an element with respect to oxygen

• A. increases one by one from $ IA$ to $VILA$
• B. decreases one by one from $IA$ to $VIIA$
• C. increases one by one from $IA$ to $IVA$ and then decreases from $VA$ to $VIIA$ one by one
• D. decreases one by one from $IA$ to $IVA$ and then increases from $VA $ to $VIIA$ one by one.

Answer 1

Answer: (C)

As we move along the period, an electron is subsequently added in the outer most shell of the elements and valency increases. However when the number of valence electrons is more than $4,$ then the valency is given by

valency $=8 -$ valence electrons