|Class 11 Chemistry Chemical Bonding Structure||Polarization|
Ionic bond is formed by transfer of electrons .As a result, the cation and anion are formed .So, cation formed distort the shape of electron cloud of anion as shown in figure:
Distortion of electron cloud of the negatively charged ion by the positively charged ion is called Polarization.
The Extent of polarization: Is given by Fazan rule
According to Fazan,
For Example:- NaCl< CaCl2 < AlCl3
(Maximum covalent character in aluminium chloride)
For Example:- Na+ = 1s2, 2s2, 2p6
Cu+ = 1s2,2s2,2p6,3s2,3p6,4s1,3d10
Out of NaCl and CuCl, the latter has more covalent character.