Which of the following best describes the lanthanide contraction?
A) f-orbitals are more directional than d-orbitals and therefore less effective at screening nuclear charge
B) f-orbitals are more diffuse than d-orbitals and therefore less effective at screening nuclear charge
C) the increase in atomic and ionic radii as one goes from left to right across the lanthanides
D) A and C
E) B and C
Correct Answer:
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