Q.

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

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a

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

b

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

c

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

d

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

answer is B, C.

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Detailed Solution

The co-ordination number of FCC structure for metals is 12. This is because;

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.

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