for1. In inorganic chemistry, Fajans' Rules, formulated by Kazimierz Fajans in 1923, 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:
Ionic Covalent
Low positive charge High positive chargel
Large cation Small cation
Small anion Large anion
in 1.. statement b is false