Question

suitable examples for fajans rule

Answer 1

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

NaCl is correctly predicted to be ionic since Na+ is a larger ion with a low charge and Cl− is a smaller anion.

Compounds are more likely to be covalent if: there would be a large positive charge on the cation, the cation would be small, and the anion would be large. For example, AlI3s correctly predicted to be covalent since it would have a small cation with a high charge and a large anion.

Answer 2

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Here is your answer

» For a given cation, covalent character Increases with increase in size of the anion

» For a given anion, covalent character increases with a decrease in the size of the cation

» Covalent character Increseas with increasing charge either on cation or an anion

» Covalent character is higher for compounds with cations with pseudo noble gas electronic configuration