Llimitations of werners theory, Chemistry

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Q. Llimitations of werners theory?

There were inherent limitations with such a simple approach. For example, the following experimental facts cannot be explained on the basis of such a simple model:

certain metal ions show stronger tendency to form complexes compared to others;
certain elements can form complexes with different coordination numbers as well as in different oxidation states;
Some metal ion complexes are very reactive and exchange ligands in typical substitution of reactions whereas others do not.
a particular geometrical shape appears to be preferred by some ions;
Most of the transition element complexes show typical sharp colours.

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