What is the ability of an anion to undergo distortion called?
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Solution
Fajan's rule
Fajans discussed the partial covalent character of ionic bonds.
The % covalent character of an ionic bond is determined by the polarising power of the cation, the polarizability of the anion, and the extent of distortion (polarisation) of the anion.
Polarizability refers to the ability of an anion to become polarised by a cation.
So, the ability of an anion to undergo distortion is called polarizability.