Mn exhibits maximum oxidation states from +2 to +7 and it lies in the first half of the transition series. With an increase in atomic number of the elements, the stability of +2 oxidation state increases. As more and more electrons are filled in the d-orbital, this occurs repeatedly with increase in atomic number. The +2 oxidation state is not shown by Scandium. It has an electronic configuration of 4s2 3d1. Scandium undergoes a loss of all its three electrons to form Sc3+ and this +3 oxidation state of Sc is very stable. This is so because by losing all three electrons, it attains nearest noble gas electronic configuration, which is of [Ar]. Ti (+ 4) and V(+5) are very stable for the same reason. For Mn, +2 oxidation state is very stable as after losing two electrons, it achieves half-filled stable electronic configuration, [Ar] 3d5.