In a compound, atoms of element Y form ccp lattice and those of X occupy `2//3` rd of tetrahedral voids. The formula of the compound will be `:`

Options

A. `X_(3) Y_(4)`
B. `X_(4) Y_(3)`
C. `X_(2) Y_(3)`
D. `X_(2)Y`

Answer

B

Explanation

No. of Y atoms in a unit cell = 4
No. of tetrahedral sites = 8
No. of X atoms in a unit cell ` = 8 xx ( 2)/( 3) = ( 16)/( 3)`
Compound `: X_(16//3)Y_(4) ` or `X_(4) Y_(3)`