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85 . The radius of an atom is $300 \mathrm{pm}$. If it crystallises in a face-centered cubic lattice, the length of the edge of the unit cell is
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Verified Answer
The correct answer is:
$848.5 \mathrm{pm}$
For fcc, $a=2 \sqrt{2} r$
$$
=2 \times 1.414 \times 300 \mathrm{pm}=848.5 \mathrm{pm}
$$
$$
=2 \times 1.414 \times 300 \mathrm{pm}=848.5 \mathrm{pm}
$$
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