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Question

The radius of Na+ ions is 95 pm and that of Cl ions is 181pm. Predict whether the Co-ordination number of Na+ ion is 6 or 4.

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Solution

Given:-
Radius of Na+ ion (rNa+)=95pm
Radius of Cl ion (rCl)=181pm
Therefore,
rNa+rCl=95181=0.525
Coordination no. =6(0.414<r+r<0.732)
Hence the coordination no. of Na+ ion is 6.

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