Chapter 11, Problem 11.71QE

Interpretation Introduction

Interpretation:

The number of ${\text{O}}^{\text{2-}}$ ion has to be calculated.

Concept Introduction:

The body centered cubic unit cell has the atoms at each the eight corners of a cube plus one atom in the center of the cube.  Each of the corner atoms is the corner of another cube so the corners atoms are share by 8 unit cell.

The no of atoms $\text{=}\left(\frac{\text{Number}\text{of}\text{atom}\text{shared}\text{per}\text{unit}\text{cell}}{\text{Number}\text{of}\text{corners}}\right)\text{+}\frac{\text{Number}\text{}\text{of}\text{atom}\text{per}\text{unit}\text{cell}}{\text{number}\text{of}\text{centre}\text{atom}}$