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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.
noun. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. Example sentences. 1  The antiparticle of the electron is the positron; there are also antiquarks and antineutrinos.oun. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. Example sentences. 1  The antiparticle of the electron is the positron; there are also antiquarks and antineutrinos.