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A subatomic particle is a unit of matter or energy that's the fundamental makeup of all matter. According in modern atomic theory, an atom has a nucleus, which is its center, or core. The nucleus contains subatomic particles: protons and neutrons. Protons are positively-charged particles.
The three main types of subatomic particles, indeed, the only three types, are protons, neutrons, and electrons. Electrons are very light; protons and neutrons have about 20â¦00 time as much mass, and very similar masses to one another.