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The number of atoms in body centred and face centred cubic unit cell respectively are
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2 and 4
$Z_{\mathrm{BCC}}=\frac{1}{8} \times 8+1=2 \quad Z_{\mathrm{FCC}}=\frac{1}{8} \times 8+\frac{1}{2} \times 6=1+3=4$
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