Question

The number of tetrahedral and octahedral voids in a $ccp$ array of $100$ atoms are respectively

• A. 200 and 100
• B. 100 and 200
• C. 200 and 200
• D. 100 and 100
• E. 50 and 50

Answer 1

Answer: (A)

In CCP effective number of atom is always equal to octahedral voids and $2$ times of tetrahedral voids
i. e. if no of atoms are $100$ then,
Octahedral voids $=100$
tetrahedral voids $=2\times 100=200$