In which of the following crystals, alternate tetrahedral voids are occupied? — Solid State Chemistry Question

💡 Solution & Explanation

In zinc blende (ZnS) structure, $S_2$- ions form a CCP lattice and Zn2+ ions occupy alternate tetrahedral voids (50% occupancy). In $CaF_2$ and $Na_2O$, 100% of the tetrahedral voids are occupied. In $NaCl$, octahedral voids are occupied.