Fajan Rule: Greater is the polarization, greater is the covalent character. | Online Chemistry tutorial IIT, CBSE Chemistry, ICSE Chemistry, engineering and. This lesson will talk about polarization of ionic compounds and Fajans’ rules. Fajans’ rules discuss introduction of covalent character in ionic. Inorganic Chemistry/Chemical Bonding/Fajan’s Rule. From Wikibooks, open books for an open world. < Inorganic Chemistry | Chemical Bonding. Unreviewed.

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Gas To Solid Is Called. Compounds are more likely to be covalent if: Comments It is very helpful thak u very much!!! This makes the anion easily polarizable.

When a cation approaches an anion, the electron cloud of the anion is attracted towards a cation and hence gets distorted. Fajans’ rule states that a compound with low positive charge, large cation and small anion has ionic bond where as a compound with high positive charge, small cation and large anion are covalently bonded.

To use Fajans’ Rules, assume your binary compound is ionic and identify the potential cation and anion. Retrieved from ” https: The large charge pulls on the electron cloud of the iodines. Larger the charge on the cation, greater is its polarising power.

Fajans’ Rule – Disclosing Covalent Characteristics in Ionic Bonds

From Wikipedia, the free encyclopedia. By using this site, you agree to the Terms of Use and Privacy Policy. By Fajans’ Rules, compounds are more likely to be ionic if: The “size” of the charge in an ionic bond depends on the number of electrons transferred.


A cation having inert gas like configuration has less polarising power in comparison to cation having pseudo-inert gas like configuration.

Fajans’ rules

For help asking a rile homework question, see: Jj Thomson Atomic Theory. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

They can be summarized in the following table:. The covalent fakan exist in all the three states i. In reality, every bond has some covalent as well as ionic characteristics. They are generally soluble in organic solvents but insoluble in water and other polar solvents.

What Is Valence Bond Theory. Chemistry Stack Exchange works best with JavaScript enabled. This page was last edited on 18 Novemberat The covalent character is found in compounds which have high polarizing cation and high polarizable anion. Home Questions Tags Users Unanswered. In the time with the help of X-ray crystallography, he was able to predict ionic or covalent bonding with the attributes like ionic and atomic radius.

They usually consists of molecules rather than ions. Covalent compounds have low melting and boiling point because the molecules in covalent compounds are held together less rigidly. Note that Fajans’ Rules have been largely displaced by Pauling’s approach using electronegtivites. Let us consider AlF 3this is an ionic bond which was also formed by transfer of electron.


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The greater is the polarisation produced, more is the neutralisation of the charges fajna hence the ionic character decreases or the covalent character increases. How do I ask homework questions on Chemistry Stack Exchange? However, the remnants of Fajans’ Rules are found in Hard-Soft Acid-Base Theorywhich predicts bonding properties based on polarizability which is based on size and charge.

What is Fajans rule?

bond – What is Fajans rule? – Chemistry Stack Exchange

Hence, atoms in a molecule can take up different directional arrangement and thus show structural and stereoisomerism. For high charge, small cation will have more polarizing power. Boiling Point Of Oxygen. Two contrasting examples can illustrate the variation in effects. Login to track and save your performance.