Sodium metal crystallizes in $B.C.C.$ lattice with an edge length of $4.29 \ \mathring{A}$. The radius of the sodium atom is:
- A$2.857 \ \mathring{A}$
- B$1.601 \ \mathring{A}$
- C$2.145 \ \mathring{A}$
- D$1.857 \ \mathring{A}$
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