[Olympiad] A metal crystallizes in a face-centered cubic (FCC) lattice. What is the packing efficiency of this unit cell?
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52%
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68%
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74%
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78%
📝 Detailed explanation
FCC (Face-Centered Cubic) has the highest packing efficiency among the cubic systems, which is approximately 74%. (BCC is 68%, Simple Cubic is 52%).
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