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why do transition elements are more polarizing than others?

According to Fajan's rules, nature of bonds formed by larger cations is predominantly ionic since they have less polarizing power.
However, transition metals tend to form coordinate covalent bonds due to relatively smaller sizes. The compounds formed by transition metals have significant covalent nature.The non-transition elements are more ionic than the transition elements because their cations have lower polarizing power and so the cations are more stable.


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