Question

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is:

• A. exactly the same in both cases
• B. partly same and partly different
• C. different from each other
• D. nothing definite

Answer 1

The correct option is A exactly the same in both cases

The arrangement of the first two layers, one above the other, in hcp and ccp arrangement is exactly the same in both cases. It is an AB type.

The arrangement of the third layer in hcp is ABA type. The overall arrangement becomes ABAB type. The arrangement of the third layer, one above the other, in ccp is ABC type. The overall arrangement becomes ABCABC type.

Hence, the correct option is ( A )