Question

Whose mass is the largest among electron proton and neutron

Answer 1

Explanation:

electron mass is smallest

and generally neutron mass is slightly higher than protons

Answer 2

Answer:

If by "biggest" and "smallest", you mean mass (which is a measure of how much matter is there), then the smallest is the hydrogen atom with one proton and one electron. Since electrons are about 2000 times less massive than protons (and neutrons), then the mass of an atom is mostly from the protons and neutrons.