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

Ti has an atomic number off 22 and electronic configuration [Ar]3d²4s² and can show three oxidation states of +2,+3 and +4 in various compounds like TiO₂9(+4), Ti₂O₃(+3) and TiO(+2). The non transition elements like the p block elements show variable oxidation states like in case of phosphorous. It has -3,+3 and +5. Lower oxidation states are ionic in nature as they accept electrons and higher oxidation states by unpairing the electrons and shifting to d orbitals.