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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What Is Valence Bond Theory. Take learning on the go with our mobile app. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

Inorganic Chemistry/Chemical Bonding/Fajan’s Rule – Wikibooks, open books for an open world

Comments It is very helpful thak u very much!!! They usually consists of molecules rather than ions. Two ryle examples can illustrate the variation in effects. The effect is called polarisation of the anion. You have selected the wrong answer!! How do I ask homework questions on Chemistry Stack Exchange? The users who voted to close gave this specific reason: Thus, we get rkle ionic compound metal bonded to a nonmetal with slight covalent character.

Compounds are more likely to be covalent if: Note that Fajans’ Rules have been largely displaced by Pauling’s approach using electronegtivites. They are generally soluble in organic solvents but insoluble in water and other polar solvents.

For high charge, small cation will have more polarizing power. Fajans’ rules note the difference were formulated in by Kazimierz Fajans.


Congratulations You have selected the correct answer!! Home Questions Tags Users Unanswered. To use Fajans’ Rules, assume your binary compound is ionic and identify the potential cation and anion. The crystal structure of covalent rjle differ from that of ionic compounds.

bond – What is Fajans rule? – Chemistry Stack Exchange

Larger the charge on the cation, greater is its polarising power. Views Read Edit View history. This question appears to be off-topic. 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.

As the atoms in covalent compounds are held together by the shared electrons ,it is rigid and directional. What is Fajans rule? In the case of aluminium iodide an ionic bond with much covalent character is present. 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.

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. Let us consider AlF 3this is an ionic bond which was also formed by transfer of electron. Since there are no free ions in covalent compounds to conduct electricity, they are bad conductors of electricity.

Where as larger is the size of anion, more will be the polarization of anion. Covalent character of lithium halides is in the order:. Practise This Question The acid formed when sulphur trioxide reacts with water is. 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. Retrieved from ” https: They can be summarized in the following table:.


Fajans’ rules

Jj Thomson Atomic Theory. When a cation approaches an anion, the electron cloud of the anion is attracted towards a cation and hence gets distorted. Leave a Reply Cancel reply Your email address will not be published. For help asking a good homework question, see: The fluorine’s electron cloud is definitely less shielded from the nuclear charge and will thus be less polarizable.

This makes the anion easily polarizable. Hence, atoms in a molecule can take up different directional arrangement and thus show structural and stereoisomerism.

Non Biodegradable Waste Management. The “size” of the charge in an ionic bond depends on the number of faman transferred. Practise s of questions mapped to your syllabus. Login to track and save your performance.

They can be summarized in the following table: Let us consider AlI 3 ; this is an ionic bond which was formed by transfer of electrons. Now, if we take a different example, for example AlF 3 Aluminium Fluoride. A cation having inert gas like configuration has less polarising power in comparison to cation having pseudo-inert gas like configuration. By Fajans’ Rules, compounds are more likely to be ionic if: This produces an ionic bond with covalent character. The greater is the polarisation produced, more is the neutralisation of the charges and hence the ionic character decreases or the covalent character increases.