question_answer 3)

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

Answer:

Manganese (Z = 25) exhibits largest number of oxidation states. This is because its electronic configuration is 3d54s2 and it has maximum number of electrons (five d electrons and two s electrons) to lose or share. Thus, it can exhibits an oxidation state of +2 to +7 which is the maximum number.