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A metal crystallizes in f.c.c. Then, the...

A metal crystallizes in f.c.c. Then, the ratio of number of its first nearest neighbours to the second nearest neighbours is ...........

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The correct Answer is:
2
In FCC - latice
First layer - 12 neighbours (nn)
Second layer - 6 neighbour (Snn second m)
Third layer - 24 neighbours.
Seventh layers - 48 neighbours
13 th layer - 72 neighbour
`"ratio of "("nn")/("Snn")=(12)/(6)=2`
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