MDCAT Chemistry MCQ #962

Which subatomic particle's mass contributes most significantly to atomic mass?

MDCAT Chemistry MCQ #962

  1. Question 1

    Q1. Which subatomic particle's mass contributes most significantly to atomic mass?

    • A) Neutron
    • B) Electron
    • C) Proton
    • D) All contribute equally

    Answer: Neutron

    Explanation: Neutrons and protons have nearly identical mass (~1836 times electrons). Electrons (B) contribute negligibly.