Question

33. The number of atoms in the HCP unit cells is
(A) 4
(B) 6
(C) 12
(D) 17​

Answer 1

Answer:

(b). 6

The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.