The largest oxidation number exhibited by an element depends on its outer electronic configuration. With which of the following outer electronic configurations the element will exhibit the largest oxidation number?
(i) 3d1 4s2
(ii) 3d3 4s2
(iii) 3d5 4s1
(iv) 3d5 4s2
Option (iv) 3d5 4s2 is the answer.