What may the possible oxidation state of transition metals with the following electronic configurations in the ground state of their atoms ?
(i) `3d^(3)4s^(2)` (ii) `3d^(5)4s^(2)` (iii) `3d^(6)4s^(2)`.

Explanation

(i) The element with `3d^(3)4s^(2)` configuration (18+3+2+=23) is vanadium. The possible oxidation states are : +2,+3,+4,+5.
(ii) The element with `3d^(4)4s^(2)` configuration (18+5+2+=25) is manganese. The possible oxidation states are : +2,+3,+4,+5,+6,+7.
(iii) The element with `3d^(6)4s^(2)` configuration (18+6+2+=23) is iron . The possible oxidation states are : +2,+3,+4,+5,+6