試題詳解

10. 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