Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why?

Which of the 3d-seres of the transition metals exhibits the leagest number of oxidation states ?

(a) Define transition elements. Give the general electronic configuration of the transition elements. (b) (i) Name a transition element which does not exhibit variable oxidation state. (ii) Which of the 3d series of transition metals exhibit the largest number of oxidation states? (iii) Give reason why HCl is not used to acidify KMnO_4 solution in volumetric determination of Fe^(2+)

Which metal in the first series of transition metals exhibits+1 oxidation state most frequently and why?

which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?

In the transition series of metals, the metal which exhibits the greatest number of oxidation states occurs in the middle of the series. Explain.