Metallic silver has $fcc$ structure. If the radius of the $Ag$ atom is $144 \ pm$, what is the edge length of the unit cell?
- A$4.07 \times 10^{-8} \ cm$
- B$3.22 \times 10^{-8} \ cm$
- C$2.63 \times 10^{-8} \ cm$
- D$2.23 \times 10^{-8} \ cm$
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