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Fajans' rules


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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.The rules were introduced by the Polish-born US chemist Kasimir Fajans (1887–1975).

(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: Chemistry.


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