MDCAT Chemistry MCQ #828

Why is the atomic radius of technetium (Tc) smaller than expected in the periodic table?

MDCAT Chemistry MCQ #828

  1. Question 1

    Q1. Why is the atomic radius of technetium (Tc) smaller than expected in the periodic table?

    • A) Relativistic effects on heavy elements
    • B) Poor shielding by d and f electrons
    • C) Higher ionization energy
    • D) Greater electron affinity

    Answer: Poor shielding by d and f electrons

    Explanation: D-block contraction reduces Tc's radius. Relativistic effects apply to heavier elements like Pb.