An element has a body-centered cubic $(bcc)$ structure with a cell edge of $288 \ pm$. The atomic radius is $...... \ pm$.
- A$\frac{4}{\sqrt{2}} \times 288$
- B$\frac{\sqrt{3}}{4} \times 288$
- C$\frac{\sqrt{2}}{4} \times 288$
- D$\frac{4}{\sqrt{3}} \times 288$
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$Cu$ metal crystallizes in an $fcc$ or $ccp$ lattice. If the edge length of its unit cell is $361 \ pm$, what is the radius of the $Cu$ atom (in $pm$)?
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