Chapter 9, Problem 64QRT

Interpretation Introduction

Interpretation:

The unit cell geometry of $TlCl$ under the given condition has to be determined.

Concept Introduction:

The no. of atoms in a primitive cubic unit cell is $1$ as each corner atoms are contributing $1/8$ to the unit cell.  The no. of atoms in an fcc unit cell is $4$ as each corner atoms are contributing $1/8$ to the unit cell and each face has one atom each in the middle of it contributing $1/2$ to the unit cell.

The density is the ration between the mass of the unit cell (grams) and its volume $\left(c{m}^3\right)$.  Mathematically, it can be represented as given below.

  $d=\frac{m}{v}$

Where,

  $v=$ Volume of cubic unit cell $=l^3$