Chapter 21, Problem 21.14E

Interpretation Introduction

Interpretation:

The number of formula units of $\text{ZnSe}$ in a unit cell is to be calculated. The type of cubic unit cell of $\text{ZnSe}$ is to be identified.

Concept introduction:

A unit cell of the crystal is the three-dimensional arrangement of the atoms present in the crystal. The unit cell is the smallest and simplest unit of the crystal which on repetition forms an entire crystal. Unit cell can be a cubic unit cell or hexagonal unit cell. The classification of a unit cell depends on the lattice site occupied by the atoms.