Why did the 5d-orbital fill before 4f, in case of lanthanum 57?
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Orbitals fill in order of energy. So 5D fills before 4F in some cases simply because the 5D energy levels are lower than the 4F levels for some. ...
The nuclear charge is insufficient to contract the 4F orbitals and lower their energy well below the 5D. 4F then fills first until Gadolinium is reached.
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The 5d orbital fill before 4f in case of lanthanum 57 because of LANTANIDE CONTRACTION
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