Question

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:

(1) 8, 4

(2) 6, 12

(3) 2, 1

(4) 12,6

Answer 1

Correct answer is (4).

No. of atoms in Hexagonal primitive unit cell = 6

No. of Tetrahedral voids = 2 × No. of atoms per unit cell

= 2 × 6

= 12

No. of Octahedral voids = No. of atoms per unit cell

= 6