Each unit cell of $N a C l$ consists of $4$ chloride ions and______.

13 N a^{+}

ions

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4 N a^{+}

ions

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6 N a^{+}

ions

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8 N a^{+}

ions

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Solution

The correct option is D $4 N a^{+}$ ions
NaCl has fcc structure. Thus, each unit cell has $4 N a^{+}$ and $4 C l^{-}$ in it. It has $6 : 6$ co-ordination number.

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