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

Which of the 3d series of the transition metals exhibits the largest n

1.	Which of the 3d series of the transition metals exhibits the largest number of oxidation states and why?
Answer» Manganese exhibit the largest number of oxidation states. It shows the oxidation states +2, +3, +4, +5 ,+6, and + 7. The reason for that is the maximum number of unpaired electrons PRESENT in its OUTERMOST SHELL i.e. 3d54s2.