Which total mass is the smallest?

(1) the mass of 2 electrons

(2) the mass of 2 neutrons

(3) the mass of 1 electron plus the mass of 1 proton

(4) the mass of 1 neutron plus the mass of 1 electron

The mass of electrons, protons, and neutrons:

electrons 9.10938291*10^-31 kg

protons 1.67262178*10^-27 kg

neutrons 1.6749*10^-27 kg

the mass of electrons is way smaller than both, the mass of protons and neutrons

therefore, 1) the mass of 2 electrons is the smallest