**Packing efficiency** of fcc (and hcp) close-packed structures is:
A52.4%
B68.0%
C74.0%
D100%
Answer & Solution
Correct answer: C. 74.0%
Close-packed structures (fcc, hcp): 74% packing efficiency — highest possible for identical spheres. bcc = 68%, simple cubic = 52.4%.
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