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for the first series of transition metal...

for the first series of transition metal the `E^(0) (Theta)` Value are `E^(Theta),V,Cr,Mn,Fe,Co,Ni,Cu`
`(M^(2+)//M^(+1)),-1.18,-0.91,-1.18,-0.44,-0.28,-0.25,+0.34`
`Explain the irregularity in the above Values.

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The `E^(ɵ)` `((M^(2+))/(M))` values are not regular which can be explained from the regular variation of ionisation enthalpies `(triangle_iH_1+triangle_iH_2)` and also the sublimation enthalpies which are relatively much less for manganese aned vanadium.
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