$Na$ metal crystallizes in a $BCC$ structure. If the edge length of the unit cell is $4.29 \ \overset{o}{A}$,then the radius of the $Na$ atom is = ...... $cm$.
- A$1.857 \times 10^{-8}$
- B$2.371 \times 10^{-7}$
- C$3.817 \times 10^{-8}$
- D$9.312 \times 10^{-7}$
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