MDCAT Chemistry MCQ #848

Which subatomic particles determine the atomic radius trend from sodium to chlorine in Period 3?

MDCAT Chemistry MCQ #848

  1. Question 1

    Q1. Which subatomic particles determine the atomic radius trend from sodium to chlorine in Period 3?

    • A) Valence electrons
    • B) Protons
    • C) Core electrons
    • D) Neutrons

    Answer: Valence electrons

    Explanation: Valence electrons are pulled closer by increasing protons, shrinking atomic radius; core electrons are shielded.