Answer: 0.225 to 0.414.
- A 0.155 to 0.225
- B 0.225 to 0.414
- C 0.414 to 0.732
- D 0.732 to 1.000
Correct answer: B. 0.225 to 0.414
Explanation: A cation with radius ratio between 0.225 and 0.414 relative to the anion fits into a tetrahedral void and has 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.