What may be the stable oxidation state of the transition element with the following d-electron configuration in the group state of their atoms ? `3d^3, 3d^5, 3d^8, 3d^4`

Explanation

Stable oxidation states are:
`3d^3` (Vanadium) : +2, +3, +4, +5
`3d^5` (Chromium): +3, +4, +6
` 3d^8` (Cobalt) : +2, +3
`3d^4` : There is no dt configuration in ground state