I think what your asking is whether or not you can get smaller masses than an electron, proton or neutron. The answer is yes. Protons, neutrons and electrons are sub-atomic particles. Electrons actually behave as waves as well as particles but do still have a mass it is just very small compared to a proton or neutron.
Therefore, all particles even a photon can exhibit energy which can be considered mass - but this does not mean a photon actually HAS mass, it just exhibits energy that can be considered as mass when the photon is moving. A photon, however, is not considered to have a mass at 'rest'. The smallest particles to have a 'mass' as we conventionally think of a mass are neutrinos. There is some debate as to whether they have a mass, but recent data suggests they do.
However, this is an incorrect perspective, as quantum mechanics demonstrates that electrons are more complicated. A proton is one of three main particles that make up the atom. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom.
Together with neutrons, they make up virtually all of the mass of an atom. Atoms of all elements—except for most atoms of hydrogen—have neutrons in their nucleus. Unlike protons and electrons, which are electrically charged, neutrons have no charge—they are electrically neutral. The zero stands for "zero charge". As you might have already guessed from its name, the neutron is neutral. In other words, it has no charge whatsoever and is therefore neither attracted to nor repelled from other objects.
Neutrons are in every atom with one exception , and they are bound together with other neutrons and protons in the atomic nucleus. Before we move on, we must discuss how the different types of subatomic particles interact with each other.
When it comes to neutrons, the answer is obvious. Since neutrons are neither attracted to nor repelled from objects, they don't really interact with protons or electrons beyond being bound into the nucleus with the protons.
Even though electrons, protons, and neutrons are all types of subatomic particles, they are not all the same size. When you compare the masses of electrons, protons, and neutrons, what you find is that electrons have an extremely small mass, compared to either protons or neutrons.
On the other hand, the masses of protons and neutrons are fairly similar, although technically, the mass of a neutron is slightly larger than the mass of a proton. Because protons and neutrons are so much more massive than electrons, almost all of the mass of any atom comes from the nucleus, which contains all of the neutrons and protons.
The third column shows the masses of the three subatomic particles in "atomic mass units. Negative and positive charges of equal magnitude cancel each other out. Electrons are the negatively charged particles found in the electron cloud that surrounds the nucleus. And neutrons are the neutrally charged particles also found in the nucleus of the atom. The nucleus is the region at the center of the atom that contains the protons and neutrons, whereas the atom is the entire structure of protons, neutrons, and electrons arranged in a nucleus and electron cloud.
These different particles, or groups of particles, have different masses, so we want to find the smallest one. Since atoms are made up of protons, electrons, and neutrons and nuclei are made up of protons and neutrons, we can eliminate them from consideration. Even the lightest atom of hydrogen has a proton and an electron. The constituent parts must be lighter than the whole. So, among these three remaining subatomic particles, proton, electron, or neutron, which one has the smallest mass?
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