How does the mass of an electron compare to the mass of a proton?

1 Answer
Nov 17, 2017

An electron's mass is approximately 2,000 (sometimes guessed at around 1,840) times smaller than the mass of a proton.


Neutrons have the largest mass, but protons are approximately 99.9% of a neutron's size. They're very close in size, but an electron is so much smaller.