Chapter 8, Problem 139QGW

(a)

Interpretation Introduction

To explain: The reason behind the identical size of ${\text{Se}}^{2-}$ and ${\text{Br}}^{-}$.

(b)

Interpretation Introduction

To explain: The reason behind the slightly bigger size of ${\text{Se}}^{2-}$ than ${\text{Br}}^{-}$.

(c)

Interpretation Introduction

To identify: A singly charged cation which has almost the same size as ${\text{Se}}^{2-}$ than ${\text{Br}}^{-}$.