**Coordination number** of a particle in a face-centred cubic (fcc) lattice is:
A6
B8
C10
D12
Answer & Solution
Correct answer: D. 12
In fcc (and hcp), each particle touches 12 neighbours — 6 in its own layer, 3 in the layer above, 3 in the layer below. Highest CN among common 3D arrangements.
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