It
is the ratio between the radius of cation to radius of anion.
Radius
Ratio = rc/ ra
Depending
on this we can say the shape of the 1:1 type ionic compounds and also the
coordination number.
Sl. No
|
Co-ordination Number
|
Radius Ratio
|
Shape
|
1
|
2
|
>
0.155
|
 |
2
|
3
|
0.155
to 0.225
|
 |
3
|
4
|
0.225
to 0.414
|
 |
4
|
4
|
0.414
to 0.732
|
 |
5
|
6
|
0.414
to 0.732
|
 |
6
|
8
|
0.732
to 1.000
|
 |
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