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Q)

In a face centred cubic (fcc) arrangement, the number of atoms per unit cell is

$\begin{array}{1 1} 8 \\ 4 \\ 2 \\ 1 \end{array} $

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Answer : 4
 
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4 is the answer as

the no of atoms=8*1/8+6*1/2

the number of corner atoms + the number of face atoms
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