A compound formed by elements X and Y crystallizes in the cubic structure where Y atoms are at the corners of the cube and X atoms are at the alternate faces. What is the formula of the compound ?

A compound formed by elements X and Y crystallizes in the cubic struct

1.	A compound formed by elements X and Y crystallizes in the cubic structure where Y atoms are at the corners of the cube and X atoms are at the alternate faces. What is the formula of the compound ?
Answer» Solution :As there are 8 Y ATOMS at the corners and CONTRIBUTION of each =`1/8`, therefore , no. of Y atoms/unit CELL `=8xx1/8=1` . There can be only two X atoms on ALTERNATE faces. As contribution of each of them =`1/2`, therefore, no. of X-atoms/unit cell =`2xx1/2=1`. Hence, formula is XY