The transition metals exhibit a variable number of oxidation states in their compounds. This is one of the notable features of the transition elements. Few elements show exceptions for this case, most of these show variable oxidation states. These different oxidation states are relatable to the electronic configuration of their atoms. The stability of oxidation states for transition metals depends on the electronic configuration of the elements. For example, oxidation states of transition metals exhibited by elements of the first series are listed in the table given below. Sc,Ti,V,Cr,Mn,Fe,Co,Ni can show +3 oxidation state also.