Question

Which of the combinations of crystal structure and coordination number is correct?

• A. body-centered cubic – 8
• B. face-centered cubic – 6
• C. diamond – 4
• D. hexagonal closed packed – 12

Hint:

FCC and HCP both have coordination number 12; diamond has tetrahedral coordination 4.

Answer 1

The Correct Option is A, C, D

Step 1: Coordination numbers.
BCC → coordination = 8 → (A) correct.
FCC → coordination = 12, not 6 → (B) incorrect.
Diamond → coordination = 4 → (C) correct.
HCP → coordination = 12 → (D) correct.

Step 2: Conclusion.
Correct set is (A), (C), (D).