FAJANS RULES PDF

According to this rule covalent character is more , when :. In ionic compound , cation attracts the electrons of anion towards itself. The ability of cation to attract the electrons of anion is called polarizing power. The electrons of anion get attracted towards the cation.

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Rules indicating the extent to which an ionic bond has covalent character caused by polarization of the ions. Covalent character is more likely if: 1 the charge of the ions is high; 2 the positive ion is small or the negative ion is large; 3 the positive ion has an outer electron configuration that is not a noble-gas configuration.

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Fajans' Rules for Chemical Bonds

Rules indicating the extent to which an ionic bond has covalent character caused by polarization of the ions. Covalent character is more likely if: 1 the charge of the ions is high; 2 the positive ion is small or the negative ion is large; 3 the positive ion has an outer electron configuration that is not a noble-gas configuration. Subjects: Science and technology — Chemistry. All Rights Reserved.

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Fajan’s Rules

In inorganic chemistry , Fajans' rules , formulated by Kazimierz Fajans in , [1] [2] [3] are used to predict whether a chemical bond will be covalent or ionic , and depend on the charge on the cation and the relative sizes of the cation and anion. They can be summarized in the following table:. The "size" of the charge in an ionic bond depends on the number of electrons transferred. 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.

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Fajans' rules

When a cation approaches an anion, the electron cloud of the anion is attracted towards a cation and hence gets distorted. The effect is called polarisation of the anion. The greater is the polarisation produced, more is the neutralisation of the charges and hence the ionic character decreases or the covalent character increases. The polarising power of the cation and the polarisability of the anion and hence the formation of covalent bond depends on:.

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