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  4. A fcc unit cell of aluminium contains how many atoms ?

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Q. A $fcc$ unit cell of aluminium contains how many atoms ?

The Solid State

Solution:

$\frac{1}{8} \times 8$(at corners) $ = 1$
$\frac{1}{2}\times 6$ (at face centre)$ = 3$
$\therefore $ Total number of atoms $(z) = 1 + 3 = 4$