**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.
Related questions
Ionic solids must always maintain:Vacancy and interstitial defects are shown by solids that are:An interstitial defect changes the density of a substance by:Particles occupying an interstitial site give a defect that is:A cell with extra particles on two opposite faces is:A cell with an extra particle at the centre of every face is:A cell with one extra particle at its centre is called:Centred unit cells come in how many types?