Question

A compound $M_p{X}_q$ has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is

• A. MX
• B. $M{X}_2$
• C. $M_{2}X$
• D. $M_5{X}_{14}$

Answer 1

The correct option is B $M{X}_2$

Number of M atoms = $\frac{1}{4}\times 4+1=1+1=2$
Number of X atoms = $\frac{1}{2}\times 6+\frac{1}{8}\times 8=3+1=4$
So, formula of compound is $M_2{X}_4=M{X}_2$