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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.
Chapter 2. Topic: Atoms, bonding. Main concepts: â¢Atoms are the smallest unit of an element. â¢Atoms bonded together make up molecules. â¢Atoms are composed of sub-atomic particles: protons (positive charge), electrons (negative charge), and. neutrons (no charge). Protons and neutrons have mass.