(C) In the $NaCl$ crystal structure,the $Cl^-$ ions occupy the lattice points of a face-centered cubic $(fcc)$ or cubic close-packed $(ccp)$ arrangeme

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(C) In the $NaCl$ crystal structure,the $Cl^-$ ions occupy the lattice points of a face-centered cubic $(fcc)$ or cubic close-packed $(ccp)$ arrangement. The $Na^+$ ions are smaller in size and occupy all the octahedral voids present in the $ccp$ lattice of $Cl^-$ ions. Therefore,$Na^+$ ions are located in the octahedral voids.