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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