MDCAT Chemistry MCQ #822

Why is the atomic radius of lithium smaller than expected in its group?

MDCAT Chemistry MCQ #822

  1. Question 1

    Q1. Why is the atomic radius of lithium smaller than expected in its group?

    • A) High nuclear charge
    • B) Poor shielding by inner electrons
    • C) Greater electron affinity
    • D) Smaller principal quantum number

    Answer: Smaller principal quantum number

    Explanation: Lithium's n=2 electrons are closer to the nucleus than heavier alkali metals. A and B are true but not primary causes.