| Electronic configuration in ground state | Stable oxidation states |
| $(i)$ $3d^3$ (e.g.,$V$) | $+2, +3, +4, +5$ |
| $(ii)$ $3d^5$ (e.g.,$Cr$ or $Mn$) | For $Cr$: $+3, +6$; For $Mn$: $+2, +4, +6, +7$ |
| $(iii)$ $3d^8$ (e.g.,$Ni$) | $+2, +3$ |
| $(iv)$ $3d^4$ | There is no transition element with a $3d^4$ configuration in the ground state (as $Cr$ is $3d^5 4s^1$). |
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