MDCAT Chemistry MCQ #882

Why is the effective nuclear charge experienced by 2s electrons greater than 2p electrons?

MDCAT Chemistry MCQ #882

  1. Question 1

    Q1. Why is the effective nuclear charge experienced by 2s electrons greater than 2p electrons?

    • A) 2s electrons are closer to the nucleus
    • B) 2p electrons have higher spin
    • C) 2s electrons penetrate more effectively
    • D) 2p orbitals have more nodes

    Answer: 2s electrons penetrate more effectively

    Explanation: Penetration allows 2s electrons to spend more time near the nucleus. Option A is partially correct but less precise than C.