Question

Choose the correct statement(s) :

Answer 1

Radius-Ratio Rule:
Size and type of void occupied by an ion is determined by knowing relative size of cations and anions.

$\text{Radius ratio}=\frac{\text{Radius of Cation}}{\text{Radius of Anion}}$

Larger the size of cation/void ,greater is its coordination number.
Greater the radius ratio, greater is its coordination number

Radius Ratio	Type of void occupied	Coordination Number	Examples
< 0.155	Linear Void	2
0.155 to 0.225	Planar Triangular void	3	Boron Oxide
0.225 to 0.414	Tetrahedral Void	4	Zinc Sulphide
0.414 to 0.732	Octahedral Void	6	Sodium Chloride
0.732 to 1	Body Centred Cubic Void	8	Caesium Chloride