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