Question

The number of tetrahedral and octahedral voids in CCP unit cell are respectively.

• A. $4,8$
• B. $8,4$
• C. $12,6$
• D. $6,12$

Answer 1

The correct option is B $8,4$

The number of tetrahedral and octahedral voids in CCP unit cell is $8,4$ respectively.

The number of particles in ccp$=4$. Hence the number of tetrahedral and octahedral voids are $8$ and $4$ respectively.

Note:

The number of tetrahedral voids is twice the number of particles.

The number of octahedral voids is equal to the number of particles.

Hence, the correct option is $\text{B}$