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A set of rules that define the degree of covalent bond character in ionic compounds.
Kazimierz Fajans was a Polish chemist who discovered the element protactinium.
When cation and anion approaches eachother for the formation of ionic bond, then due to higher z effective of cation, it attracts electron cloud of anion towards itself. Due to which partial neutralization of charges occur and it develops covalent character in thr bond. Thus, the phenomenon of deforming of electron cloud of an ion by cation is known as polarisation.
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