Sodium metal crystallizes as a body-centered cubic $(bcc)$ lattice with the cell edge $4.29 \ \mathring{A}$. What is the radius of a sodium atom?
- A$1.857 \times 10^{-8} \ cm$
- B$2.371 \times 10^{-7} \ cm$
- C$3.817 \times 10^{-8} \ cm$
- D$9.312 \times 10^{-7} \ cm$
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