Which of the following particles has mass? A.protons only B.electrons only C.both protons and electrons
electrons. The proton is slightly less massive than the neutron, and the electron is many, many times less massive than either of them. That makes the electron the smallest of the "standard" particles that make up atoms. There are many smaller particles in what is called the particle zoo, but it is hard to sort them out as they are all uniformly unstable and disappear in very short periods of time. The electron is the least massive of the stable subatomic particles that make up the nucleus. Note: We added the last part because the neutron is not stable outside the nucleus of the atoms that it makes up. But of the "big three" particles that are the building blocks of the atom, the neutron, proton and electron, the electron is smallest. It's less than 1/1800th the mass of a proton.
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