$A$ metal $(X)$ of atomic weight $M \ g \ mol^{-1}$ crystallizes in a $bcc$ lattice. Its density is $d \ g \ cm^{-3}$. What is the equation for the unit cell edge length $(a)$? ($N=$ Avogadro number)

  • A
    $a = \left( \frac{2M}{Nd} \right)^{\frac{1}{3}}$
  • B
    $a = \left( \frac{2M}{Nd} \right)^{\frac{1}{2}}$
  • C
    $a = \left( \frac{4M}{Nd} \right)^{\frac{1}{3}}$
  • D
    $a = \left( \frac{M}{Nd} \right)^{\frac{1}{3}}$

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