The co-ordination number of FCC structure for metals is 12,…

Chemistry Solid State General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

The co-ordination number of FCC structure for metals is 12, since

each atom touches 4 others in same layer, 3 in layer above and 3 in layer below.

each atom touches 4 others in same layer, 4 in layer above and 4 in layer below.

each atom touches 6 others in same layer, 3 in layer above and 3 in layer below.

each atom touches 3 others in same layer, 6 in layer above and 6 in layer below.

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(b,c,) FCC can be viewed in two following ways -

(i) Planes along the faces (and parallel to it) of the unit cell.

⇒ Each atom touches 4 in same layer, 4 in layer above and 4 in layer bellow it.

(ii) Planes along closest packed spheres → each atom touches 6 atom in same layer, 3 in layer above and 3 in layer below it.

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