The number of tetrahedral and octahedral voids in hexagonal primitive unit cell is — Solid State Chemistry Question

💡 Solution & Explanation

For a hexagonal primitive unit cell (HCP), the effective number of atoms ($Z$) is 6. The number of octahedral voids is equal to $Z$ (which is 6), and the number of tetrahedral voids is equal to $2Z$ (which is $2 \times 6 = 12$). Respectively, they are 12 and 6. Therefore, correct answer is C.