Question

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In the sodium chloride structure, each ${Na}^{+}$ ion is surrounded by six ${Cl}^{-}$ ions as the nearest neighbours and twelve ${Na}^{+}$ ions as the next nearest neighbours.

Answer 1

NaCl exists in a simple cubic structure. Each $N{a}^{+}$ ion is surrounded by $6$ $C{l}^{-}$ ions as the nearest neighbours and $12$ $N{a}^{+}$ as the next nearest neighbours. The unit cell is shown in the figure.