Radius Ratio Rule

Radius Ratio Rule:- The Ratio of the Radius of cation to the radius of anion is called Radius Ratio.

     

Radius Ratio Rule is used to predict the Coordination No. and Structural arrangement of Ionic Compounds.

Radius Ratio

Coordination No.

Structure

Example

0.155 – 0.225

0.225 – 0.414

0.414 – 0.732

0.732 – 1

3

4

6

8

Trigonal

Tetrahedral

Octahedral

Body centered

B2O3

ZnS, Na2O

NaCl, NaBr

CoBr

 

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12    PMT    Chemistry    The Solid State    Radius Ratio Rule