Question

Which particle has the least mass

a. electron
b. proton
c. neutron
d. all have the same mass

Answer 1

b. proton

Step-by-step explanation:

The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom. Electrons have an electric charge of −1, which is equal but opposite to the charge of a proton, which is +1.