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Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.

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The oxidation state of an element is basically the charge acquired by its atom or appears to have when it is present in the combined state with other atoms. For transition elements, there are variable oxidation states due to the presence of both valence electrons and the d-electrons. Most common oxidation states are +2 and +3. Titanium shows three oxidation states +2, +3, +4. In the case of non-transition elements, the value of oxidation state is equal to a number of electrons in the outermost shell or 8 minus the number of electrons in the outermost shell.

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