Chemistry Ionisation enthalpy of d block elements

[bharathikaruppusamy1]

Homework Statement

The regular trend in the first ionization enthalpy of the first transition series element is due to the fact that the removal of one electron alt is the relative energy of 4S and 3D orbital that for the reason energy or company ionization with some gain in exchange energy as the number of electron increase is in the in configuration and from the transparents of electron into the orbital is there is expected general increase strength in the value of increase in effective nuclear charge.

Relevant Equations

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I could understand what is ionization enthalpy extra I don't know why there is alternation in their relative energy of 4s in 3D orbital when we remove an electron from it. I couldn't understand what is reorganisation energy mean and what is its role playing in case of ionization enthalpy,what it's relationship with ionization enthalpy