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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Congratulations You have selected the correct answer!! The covalent compounds exist in all the three states i. Covalent compounds have low melting and boiling point rulf the molecules in covalent compounds are held together less rigidly.

This produces an ionic bond with covalent character.

Fajans’ rules

In the case of aluminium iodide an ionic bond with much covalent character is present. What Is Valence Bond Theory. In this case, the aluminium ion’s charge will “tug” on the electron cloud of iodine, drawing it closer to itself.

When a cation approaches an anion, the electron cloud of the anion is attracted towards a cation and hence gets distorted. They usually consists of molecules rather than ions. The covalent character is found in compounds which have high polarizing cation and high polarizable anion.


Gas To Solid Is Called. This makes the anion easily polarizable. Die Eigenschaften salzartiger Verbindungen und Atombau”. Chemistry Chemistry Articles Fajans Rule. They are generally soluble in organic solvents but insoluble in water and other polar solvents.

To use Fajans’ Rules, assume your binary compound is ionic and identify the potential cation and anion.

In reality, every bond has some covalent as well as ionic characteristics. Larger the charge on the cation, greater is its polarising power. Boiling Point Of Oxygen. Since rjle are no free ions in covalent compounds to conduct electricity, they are bad conductors of electricity.

By using this site, you agree to the Terms of Use and Privacy Policy. Retrieved from ” https: The polarising power of the cation and the polarisability of the anion and hence the formation of covalent bond depends on:.

Your email address will rul be published. If two cations have the same size and 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.

The greater is the polarisation produced, more is the neutralisation of the charges and hence the ionic character decreases or the covalent character increases.


Note that Fajans’ Rules have been largely displaced by Pauling’s approach fajah electronegtivites. By Fajans’ Rules, compounds are more likely to be ionic if: 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.

How do I ask homework questions on Chemistry Stack Exchange? Hence covalent character increases. Take learning on the go with our mobile app.

Fajans’ rules – Wikipedia

The large charge pulls on the electron fajzn of the iodines. Where as larger is the size of anion, more will be the polarization of anion. Compounds are more likely to be covalent if: This page was last edited on 18 Novemberat The fluorine’s electron cloud is definitely less shielded from the nuclear charge and will thus be less polarizable.