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Coordination number of an atom in an FCC lattice is
A12
B8
C6
D4
Answer & Solution
Correct answer: A. 12
1. Pick any atom on a face: it touches 4 atoms in its own layer, 4 atoms in the layer above, and 4 in the layer below.
2. Total nearest neighbours = 4 + 4 + 4 = 12.
3. Hence the coordination number in FCC is 12.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 1 "Solid State" §1.7_
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