Chapter 12, Problem 12.77QP

(a)

Interpretation Introduction

Interpretation: The differences between the rock salt structure and caesium chloride structure of $\text{MgSe}$ are to be stated. The consistency of both the structure with the observed stoichiometry of $\text{MgSe}$ is to be explained.

Concept introduction: The rock salt structure of magnesium selenide at atmospheric pressure changes to a caesium chloride structure under pressure.

To determine: The differences between the rock salt structure and caesium chloride structure of $\text{MgSe}$.

(b)

Interpretation Introduction

To determine: An explanation for the consistency of both the structure with the observed stoichiometry of $\text{MgSe}$.