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(B) In a $NaCl$ crystal structure,which is a face-centered cubic $(FCC)$ lattice,$Na^{+}$ ions occupy the octahedral voids.Each $Na^{+}$ ion is surrou

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$12 \ Na^{+}$ ions

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(B) In a $NaCl$ crystal structure,which is a face-centered cubic $(FCC)$ lattice,$Na^{+}$ ions occupy the octahedral voids.Each $Na^{+}$ ion is surrounded by $6 \ Cl^{-}$ ions as nearest neighbours at a distance of $\frac{a}{2}$.The next nearest neighbours to a $Na^{+}$ ion are other $Na^{+}$ ions.These $Na^{+}$ ions are located at the face centers of the surrounding unit cells or across the edges.Specifically,each $Na^{+}$ ion has $12$ next nearest neighbours ($Na^{+}$ ions) at a distance of $\frac{a}{\sqrt{2}}$.

In sodium chloride crystal,the number of next nearest neighbours of each $Na^{+}$ ion is

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