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The co-ordination number of FCC structur...

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

A

each atom touches 4 others in same layer, 3 in alyer 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 atom touches 6 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

Text Solution

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The correct Answer is:
B, C
FCC can be viewed in two following ways-
(i) Planes along the faces (and parallel to it) of the unit cell.
`rArr` Each atom touched 4 in same layer, 4 in layer above and 4 in layer bellow it
(ii) Planes along closest packed spheras `rarr` each atom touches 6 atom is same layer, 3 in layer above and 3 in layer below it
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