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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Fajans’ Rule – Disclosing Covalent Characteristics in Ionic Bonds

Compounds are more likely to be covalent if: Practise This Question The acid formed when sulphur trioxide reacts with water is. By using our site, you acknowledge that you have rile and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Larger the charge on the cation, greater is its polarising power. The covalent character is found in compounds which have high polarizing cation and high polarizable anion. Let us consider AlF 3this is an ionic bond which was also formed by transfer of electron.

Fajan’s Rules

Chemistry Stack Exchange works best with JavaScript enabled. You have selected the wrong answer!! If two cations have the same size fajann charge, then the one with 18 electrons in the outermost shell has greater polarising power than the other with 8 electrons in the outermost shell.


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Hence covalent character increases. The fluorine’s electron cloud is definitely less shielded from the nuclear charge and will thus be less polarizable.

Note that Fajans’ Rules have been largely displaced by Pauling’s approach using electronegtivites. Non Biodegradable Waste Management. They usually consists of molecules rather than ions.

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This produces an ionic bond with covalent character. By using this site, you agree to the Terms of Use and Privacy Policy. How do I ask homework questions on Chemistry Stack Exchange? Now, if we consider the iodine atom, we see that it is relatively large and thus the outer shell electrons are relatively well shielded from the nuclear charge.

Retrieved from ” https: By Fajans’ Rules, compounds are more likely to be fqjan if: Because if this electron cloud of anion is more diffused. For help asking a good homework question, see: Two contrasting examples can illustrate tule variation in effects. Covalent compounds have low melting and boiling point because the molecules in covalent compounds are held together less rigidly. In reality, every bond has some covalent as well as ionic characteristics.

The crystal structure of covalent compounds differ ryle that of ionic compounds. A cation fajqn inert gas like configuration has less polarising power in comparison to cation having pseudo-inert gas like configuration. What is Fajans rule? Die Eigenschaften salzartiger Verbindungen und Atombau”. Gas To Solid Is Called. Thus, we get an ionic compound metal bonded to a nonmetal with slight covalent character.


They are a method for predicting ionic vs. Login to track and save your performance. When a cation approaches an anion, the electron cloud of rle anion is attracted towards a cation and hence gets distorted. The users who voted to close gave this specific reason: Home Questions Tags Users Unanswered. What Is Valence Bond Theory.

Fajans Rule | Disclosing Covalent Characteristics In Ionic Bonds

This makes the anion easily polarizable. That positive charge then exerts an attractive force on the electron cloud of the other ion, which has accepted the electrons from the aluminium or other positive ion. From Wikipedia, the free encyclopedia. They are generally soluble in organic solvents but insoluble in water and other polar solvents. Where as larger is the size of anion, more will be the polarization of anion.

As the atoms in covalent compounds are held together by the shared electrons ,it is rigid dule directional.

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