The number of unit cells present in $39 \ g$ of potassium if it crystallizes as a body-centered cubic $(BCC)$ structure is ($N = \text{Avogadro number}$, $\text{At. wt. of potassium} = 39$).

  • A
    $\frac{N}{4}$
  • B
    $\frac{N}{2}$
  • C
    $\frac{N}{3}$
  • D
    $N$

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