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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 subatomic particles are given below. 1  Electron - Negatively charged particle present outside the nucleus of an atom. 2  Proton - Protons are positively charged and are present inside the nucleus. 3  Neutron - Neutrons are neutrally charged particles, present within the nucleus of an atom.