Answer: AgBr.
- A NaCl
- B KCl
- C CsCl
- D AgBr
Correct answer: D. AgBr
Explanation: Frenkel defect appears in ionic solids with a large size difference between ions, such as AgBr, where the small Ag<sup>+</sup> shifts to an interstitial site.
The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.
Concept context
Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.