According to Fajan's rule, the atomic size of the Lithium is small, therefore it can distort or polarize the electron cloud of anion. ... Lithium is a very small ion, therefore it can distort or polarize the anion electron cloud. Therefore, the lithium halide has partial covalent character.

Why be halides are covalent in nature?

According to Fajan's Rule cation with small size can polarize anion effectively aand prefer to form covalent bond. ... as the size of cation with same charge decreases ionic character increases. For example BaCl2 is ionic while BeCl2 is covalent in nature.

Are halides covalent?

Halides of nonmetals, which have the highest electronegativities, are predominantly covalent. Ionic character is also affected by the total charge present on M and the size of the halogen.