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d and f BLOCK ELEMENTS
Question #38524
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Question
Which orbital filling sequence is directly responsible for the Lanthanoid contraction?
A. Filling of 5d orbitals before 4f orbitals
B. Filling of 4f orbitals before 5d orbitals
C. Filling of 3d orbitals before 4f orbitals
D. Filling of 4p orbitals before 4f orbitals
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