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I was going through the topic of 'ionic bond' and read this:

No bond is 100% ionic in character. It has some percentage of covalent character.

I didn't understand how an ionic bond can be partially covalent in character. Please explain along with an example.


marked as duplicate by Mithoron, Gaurang Tandon, aventurin, airhuff, pentavalentcarbon May 14 '18 at 20:47

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One way is Polarization. When a small cation approaches a large anion it distorts the charge density towards itself thereby forming a type of bond which has directional characteristic i.e from ** (-) ----> (+) ** which is characteristic of a covalent bond.

This polarization has some rules given by **Fajan **

  1. Smaller the cation better distortion/polarization.
  2. More the amount of positive charge more is the polarization.
  3. or more the charge : radius ratio of cation more is the polarization.

So in short every cation has the power of polarization and therefore no bond is 100% ionic.


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