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The radius of Na(+) is 95 pm and that of...

The radius of `Na(+)` is 95 pm and that of `CI^(-)`ions is 181 pm. Predict whethr the coordination number of `Na^(+)` is 6 or4.

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Radius ratio `((r^(+))/(r^(-)))=(95)/(181)=0.52`
Radius ratio lies between `0.414-0.732`, hence `Na^(+)` ions prefer to occupy octahedral voids having Co - ordination Number = 6.
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