Find the coordination number of $N a^{+}$ in $N a_{2} O$ .

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Solution

The unit cell of $N a_{2} O$ has fcc structure.
The number of atoms is $4$ per unit cell.
Formula of the unit cell will be $4 N a_{2} O = N a_{8} O_{4}$
The coordination number of $N a^{+} = 4$
It has antifluorite-type structures having $4 : 8$ co-ordination number and $N a^{+}$ ions are in all tetrahedral voids.

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