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Question
Predict the co-ordination No. of cs+ ion if `r_(Cs)^+` = 1.69Å and `r_(Cl)^-` = 1.81Å.
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Solution
The radius ratio (r+/r–) defines the coordination number of the cation
`r_(Cs^+) = 1.69 Å, r_(Cl^-) = 1.81 Å`
`∴ r_(Cs^+)/r_(Cl^-) = 1.69/1.89 = 0.9337`
Since, radius ratio is greater than 0.732, the coordination number of cation (Cs+) is 8.
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