A mineral `MX_(2)` crystallizes in ccp of `M^(2+)` ions whereas `X^(-)` ions occupy the tetrahedral voids. The number of cations and anions per unit cell, the coordination number of cation and percent of tetrahedral voids occupied are :

Options

A. 8,4,8, 100%
B. 8,4, 8, 50%
C. 4, 8, 8,50%
D. 4,8, 8, 100%

Answer

D

Explanation

The number of formula units in ccp (rank) = 4
`therefore 4MX_2`
Hence number of cations `(M^(2+))= 4`
C. N. of cation=8, All tetrahedral voids are occupied.