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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.
Smallest subdivision of matter â¢ Protons: positively charged subatomic particle â¢ Neutron: neutrally charged subatomic particle â¢ Atomic nucleus: made of protons and neutrons â¢ Electrons: negatively charged subatomic particle which is lighter than protons or neutrons that orbit the atomic nucleus â¢ An atom alone has balanced number of electrons and protons therefore being electrically neutral â¢ 92 types of atoms or elements in nature â¢ Atomic number: number of protons in the ...