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d and f BLOCK ELEMENTS
Question #38476
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Question
Which orbital filling sequence is responsible for the Lanthanoid contraction?
A. 5d orbitals filled before 4f orbitals
B. 4f orbitals filled before 5d orbitals
C. 3d orbitals filled before 4f orbitals
D. 4p orbitals filled before 4f orbitals
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