What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms : `3d^(3) 3d^(5) 3d^(8) and 3d^(4)` ?

Explanation

`3d^(3) 4s^2 : + 5, 5d^(5) 4s^1 : + 6 or 3d^(5)4s^2 : + 2 , + 7 `
` 3d^(8) 4s^2 : + 2,3d^(4) 4s^(2) :+ 6`