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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 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 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, 3 in layer above and 3 in layer below

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The correct Answer is:
B,C
From FCC unit cell
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