An element with a simple cubic structure has an edge length of unit cell $3.86 \ \mathring{A}$. What is the radius of the atom?
- A$5.79 \times 10^{-8} \ cm$
- B$1.93 \times 10^{-8} \ cm$
- C$3.86 \times 10^{-8} \ cm$
- D$2.43 \times 10^{-8} \ cm$
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