The number of octahedral void (s) per atom present in a cubic close packed structure is

a. 1

b. 3

c. 2

d. 4

Ans. a

Explanation : Number of octahedral voids in ccp, is equal to effective number of atoms. In ccp, effective number of atoms are 4 so, 4  octahedra  voids.

So, 1 octahedral voids per atom