Out of the following, the lowest packing of atoms exists in ____________________ crystal lattice structure?
Correct answer: D. Simple cubic
- A. Hexagonal close, packed (hcp)
- B. Face centred cubic (fcc)
- C. Body centred cubic (bcc)
- D. Simple cubic
Explanation
Simple cubic has atoms only at the eight corners, giving a packing efficiency of about 52%, lower than bcc, fcc, and hcp. The latter two are close-packed structures with about 74% packing efficiency.
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