Chapter 5, Problem 107QRT

Interpretation Introduction

Interpretation:

The order of decreasing size of given atoms and ions $\text{Ar,}{\text{K}}^{\text{+}}\text{,}{\text{Cl}}^{\text{-}}\text{,}{\text{S}}^{\text{2-}}\text{,}\text{and}{\text{Ca}}^{\text{2+}}$ has to be arranged and explained.

Concept Introduction:

Atomic radius: It is the distance between center of nucleus and outermost electron shell.    When two atoms are bonded together in a molecule, the sum of their radii should equal the distance between their centers.