Answer: 4 and 4.
- A 4 and 4
- B 4 and 8
- C 6 and 6
- D 8 and 4
Correct answer: A. 4 and 4
Explanation: In zinc blende, Zn²⁺ occupies tetrahedral voids (CN = 4) and each S²⁻ is surrounded by 4 Zn²⁺ (CN = 4). Both have coordination number 4.
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.