Question

In a compound, atoms of element Y from ccp lattice and those of X occupy ${\frac{1}{3}}^{rd}$ of tetrahedral voids. The formula of compound will be

• A. $X_3{Y}_2$
• B. $X_2{Y}_3$
• C. $X_4{Y}_3$
• D. $X_3{Y}_4$

Answer 1

The correct option is B $X_2{Y}_3$

Number of Y atoms in a unit cell = 4
Number of X atoms in a unit cell $=8\times \frac{1}{3}$
So, $X_{\frac{8}{3}}{Y}_4$ or $X_2{Y}_3$