question_answer

Three spheres of the first layer and three of the second layer enclose a site at the centre in a closest packing arrangement, this site is called

A) interstitial void                 

B)  tetrahedral void

C)  octahedral void      

D) cubic void

Correct Answer: C

Solution :

Octahedral void is the type of void which is surrounded by six closely packed spheres, i.e. it is formed by six spheres. Out of six spheres, four are placed in the same plane touching each other, one sphere is placed from above and the other from below the plane of these spheres. These six spheres surrounding the octahedral voids are present at the vertices of regular octahedron.