Question

Wich subatomic particles will you add or remove to change the mass of an atom? A)electrons and protons B)protons or neutrons C)electrons or neutrons D) Electrons only

Answer 1

Technically all subatomic particles have a mass, however, electrons have such a small mass, they are insignificant and generally ignored. On the other hand, the mass of a proton and neutron are substantial, so B would be the correct answer.