The component of an atom that contributes least to its mass is the

cobivictory

5 years ago

Electron is the lightest sub-particle in the Nucleus of an atom so it contributes least to the mass.

Mowinstar

4 years ago

Correct, for me according to the mass number, we find proton and neutron there, so it should be electron

aremu22

11 years ago

Protons and neutrons compose an atom's total mass.electron have little mass but they contribute slightly.