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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.
Definition - What does Beta Particle mean? A Beta Particle is a subatomic particle emitted from nucleus of radioactive atoms called beta atoms. This particle is identical with an electron. The difference between an electron and a Beta Particle is that the electron originates outside the nucleus while the Beta Particle originates inside the nucleus. It is also called high-energy electron because it moves very fast.