Chapter 12, Problem 12.61QP

Interpretation Introduction

Interpretation: The chemical formula of the oxide that crystallizes with ${\text{Fe}}^{3+}$ ions in one-fourth of the octahedral holes, ${\text{Fe}}^{3+}$ ions in one-eighth of the tetrahedral holes and ${\text{Mg}}^{\text{2+}}$ in one-fourth of the octahedral holes of a cubic closest-packed arrangement of oxide ions is to be stated.

Concept introduction: In cubic closest-packed arrangement, ions are present at the eight corners of the cube at the centre of each of the six faces of the cell.

To determine: The chemical formula of the oxide that crystallizes with ${\text{Fe}}^{3+}$ ions in one-fourth of the octahedral holes, ${\text{Fe}}^{3+}$ ions in one-eighth of the tetrahedral holes and ${\text{Mg}}^{\text{2+}}$ in one-fourth of the octahedral holes of a cubic closest-packed arrangement of oxide ions.