
Interpretation: Relation in electronic arrangement in vertical column of periodic tableis to be explained. Also how this relationship is observed among the elements of a group is to be explained.
Concept introduction:Periodic table is an arrangement where elements are arranged on the basis of their increasing

Explanation of Solution
In a periodic table, elements which belong to the same group or vertical column have same number of valence electron, only they differ in principal energy level they occupy. Example is group 18 that consist of all noble elements like
Also a similarity in chemical properties is also observed in the elements of same group like the elements of group 18.All are inert towards majority of reactions as they complete configuration of electrons. Similarly, group 17 that is halogen atoms all are highly electronegative and show similar types of reaction.
Chapter 11 Solutions
World of Chemistry, 3rd edition
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