Number of atoms in the unit cell of \( \mathrm{Na} \) (bcc) and \( ...

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Number of atoms in the unit cell of \( \mathrm{Na} \) (bcc) and \( \mathrm{Mg} \) (fcc) are, respectively.
(a) 4 and 4
(b) 4 and 2
(c) 2 and 4
(d) 1 and 1
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