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For the first row transition metals the ...

For the first row transition metals the `E^(+)` values are: `{:(E^(ϴ),V,Cr,Mn,Fe,Co,Nt,Cu),((M^(2+)//M),-1.18,-0.91,-1.18,-0.44,-0.28,-0.25,+0.34):}`
Explain the trregularity in the above valuces.

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