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Find the co-ordination number of sodium ...

Find the co-ordination number of sodium in `Na_(2)O`. 

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The correct Answer is:
4
`Na_(2)O` has antifluorite structure.
`therefore Na^(+)` ion are in tetrahedral voids `O^(-2)` ion are CCP/FCC
`therefore C.N` of `Na^(+)` is 4.
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