Assign reasons for the following: (a) There is no regular trends in E° values of M2 + /MM2 + /M systems in 3d3d series.
Due to uneven electronic configurations from left to right, irregular change in ionisation enthalpies (sum of 1st and 2nd ionisation enthalpies), heat of sublimation, and enthalpy of hydration from left to right in the period. As a result, irregular variations in Eo(M2 + /M)Eo(M2 + /M) values for ionisation metals are caused by irregular variations in ionisation enthalpies, and heat of sublimation and hydration enthalpy.
