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

💡 Solution & Explanation

In the zinc blende (ZnS) structure, the S$^{2-}$ ions form a CCP lattice while the Zn$^{2+}$ ions occupy half (alternate) of the available tetrahedral voids. In contrast, CaF$_2$ and Na$_2$O have all their tetrahedral voids occupied. Therefore, correct answer is B.