What is the coordination number of sodium in $N a_{2} O$ ?

6

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4

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8

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2

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Solution

The correct option is A $4$
$N a_{2} O$ has antifluorite crystal structure. In this structure negative ions form the Cubic Closest Packed arrangement so that each positive ion is surrounded by $4$ negative ions and each negative ion is surrounded by $8$ positive ions. So coordination no. of $N a^{+}$ is $4$ .

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