Answer: 2.
- A 1
- B 2
- C 3
- D 4
Correct answer: B. 2
Explanation: BCC has 2 atoms per unit cell: 8 × (1/8) from corners + 1 from the body centre = 2.
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.