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Q.
The order ionization energies of different orbital is
Classification of Elements and Periodicity in Properties
Solution:
In a multielectron atoms, the probability of finding an electron near the nucleus follows the order, s-electrons >$\,$ p-electrons > $\,$d-electrons > $\,$f-electrons. So, the s-electrons are more closer to the nucleus and are held more tightly than p-electrons and so on. As a result ionization energies follow the order : s >$\, $p >$\,$ d >$\,$ f.