Calculate the edge length of a unit cell if a metal having an atomic radius of $170 \ pm$ forms a simple cubic unit cell.
- A$3.40 \times 10^{-8} \ cm$
- B$3.40 \times 10^{-8} \ cm$
- C$5.12 \times 10^{-8} \ cm$
- D$6.81 \times 10^{-8} \ cm$
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