Q. Variation of valency while moving along a period left to right is shown below
image
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Select the correct statement(s)

 2018  195 Classification of Elements and Periodicity in Properties Report Error

Solution:

As given in graph I, valency increases from 1 to 7 while moving along a group in and -block. It is w.r.t. oxygen. From Graph II, valency increases from 1 to 4 and then decreases to 1 . It is w.r.t. hydrogen