In inner transition element , the electron configuration of some element occupies d sublevel (have 1 electron ) ,befor the f sublevel completely filled , as Cerium
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this is because the d orbital of cerium have lower energy as compare to f orbital so the electron can occupy d orbital besides of f orbital but when we move toward next elements(such as pr nd pm.....) the energy of d orbital becomes high and the energy of f orbital become lower so the electron enters in f orbital
abuahmed2200a:
But in this case both have same enrgy as we know , energy of sublevel is sum of (n+l)
4f (n=4,l=3) = 7
5d (n= 5,l=2)= 7
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