MDCAT Chemistry MCQ #925

Which subtopic explains why atomic radii decrease across a period?

MDCAT Chemistry MCQ #925

  1. Question 1

    Q1. Which subtopic explains why atomic radii decrease across a period?

    • A) Increased shielding
    • B) Decreased effective nuclear charge
    • C) Higher electron-electron repulsion
    • D) Stronger attraction between nucleus and valence electrons

    Answer: Stronger attraction between nucleus and valence electrons

    Explanation: Stronger nuclear attraction pulls electrons closer (D). Shielding (A) decreases, not increases.