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What may be the stable oxidation state o...

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

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`3d^(3)4s^2=+5`,`3d^(5)4s^1=+6`
`3d^(5)4s^2=+2,+7,3d^(8)4s^2=+2`
`3d^(5)4s^(2)=3d^(5)4s^(1)=+6` and `+3`
The maximum oxidation states of reasonable stability correspond to the sum of s and d-electrons up to Mn. After that, there is abrupt decrease in the stability of higher oxidation states.
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