Question

the second ionization enthalpy of alkaline earth metals is high than its first ionization energy why

Answer 1

There are three factors affecting ionisation energy:

Distance from the nucleusCharge of the nucleusRepulsion between electrons

If the electron is in the same orbital, there is no electron in a similar region of space repelling the electron, although now there is no spin either. However, the electrostatic force is stronger than spin, so it still makes a difference.

If the second electron is in a different orbital, the distance from the nucleus decreases and there are less shielding electrons, making it require more energy to ionise it. If the element is in Group I, even more energy is required (as in the next order of magnitude) as a new shell has been entered, which is far closer to the nucleus.

hope u like this answer 

pls mark as brainliest if u like the answer