Variation in Atomic and Ionic Sizes — Prelims Questions

Which of the following pairs of transition elements has nearly identical atomic radii due to lanthanoid contraction?

Which of the following statements regarding the variation of atomic radii across the 3d transition series (Sc to Zn) is correct?

Which of the following statements is a direct consequence of lanthanoid contraction?

Arrange the following ions in order of decreasing ionic radius: $Fe^{2+}$, $Fe^{3+}$, $Mn^{2+}$, $Cr^{2+}$.

Which of the following factors is primarily responsible for the near constancy of atomic radii in the middle of a transition series?

Which of the following statements correctly describes the shielding ability of different types of electrons?