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For the first row trasition metals the E...

For the first row trasition metals the `E^(ɵ)` value are:
`{:(underset(-1.18)(V),,underset(-0.91)(Cr),,underset(-1.18)(Mn),,underset(-0.44)(Fe),,underset(-0.28)(Co),,underset(-0.25)(Ni),underset(+0.34)(Cu)):}`
Explain the irregularity in the abpve values.

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Verified by Experts

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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