First slide

Covalent Bonding

Question

Which of the following has the highest percentage of ionic character in its bonding?

Moderate

A

Lil
B

MgCl₂
C

CsF
D

Csl

Solution

It is based on Fajans'rule. Smaller the size of cation larger the size of the anion. Larger the charge larger the polarising power and thus smaller the covalent nature.

Polarising power ${Cs}^{+} < {Mg}^{2 +} < {Li}^{+}, F^{-} < {Cl}^{-} < I^{-}$
Thus, CsF is maximum ionic and LiI is maximum covalent.

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