Sodium metal crystallizes in a body-centred cubic $(bcc)$ lattice with a unit cell edge of $4.29 \ \mathring{A}$. The radius of the sodium atom is approximately: .............. $\mathring{A}$

  • A
    $5.72$
  • B
    $0.93$
  • C
    $1.86$
  • D
    $3.22$

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