Discussion Forum

A compound $M_{p} X_{q}$, has a cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is

Answer:

Explanation:

Contribution of atom from the edge centre is 1/4.Therefore, number of 

$M=\frac{1}{4} \times 4$  (from edge centre )+1(from body centre)=2

 Number of X= $\frac{1}{8} \times 8$ (from corners)+$\frac{1}{2} \times 6$( from the  centre)=4

 $\Rightarrow$  Empirical formula= $M_{2}X_{4}=MX_{2}$