[Olympiad] An element crystallizes in a face-centered cubic (FCC) lattice. How many atoms are effectively contained within a single unit cell?
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1
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2
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4
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6
📝 Detailed explanation
In FCC: 8 corner atoms * (1/8 share) + 6 face atoms * (1/2 share) = 1 + 3 = 4 atoms.
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