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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.
2016-07-21T14:10:06-04:00. The electron is a subatomic particle that has a negative charge and a negligible mass. The electron travels around out side the nucleus. The subatomic particles that are inside the nucleus are protons and neutrons. The answer to your question is electron.