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Q.

Of the three types of cubic lattices, which have the highest and lowest densities for the same atoms?

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a

Highest  Lowest
Face-centered cubicBody-centered cubic

b

Highest  Lowest
Body-centered cubicFace-centered cubic

c

Highest  Lowest
Face-centered cubicSimple cubic

d

Highest  Lowest
Simple cubicBody-centered cubic

answer is B.

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Detailed Solution

The atoms number per unit cell for simple cubic, BCC and FCC lattice are 1, 2 and 4 respectively. 

Hence face centered cubic or fcc lattice has highest number of atoms per unit cell and highest density. Simple cubic has lowest density.

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