Multiple choice

Which subatomic particle has the smallest mass?

  1. Electrons

  2. Protons

  3. Neutrons

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrons have an extremely small mass of about 1/1836 amu, which is negligible compared to the mass of protons and neutrons (about 1 amu each). Therefore, electrons contribute almost nothing to the overall mass of an atom.