Atom - Smallest Particle of matter, Nucleus - centre of an atom, Proton - a subatomic particle with a positive charge in the nucleus of an atom, Neutron - a subatomic particle with a neutral charge in the nucleus of an atom, Electron - a subatomic particle with a negative charge found in all atoms, Subatomic particles - the particles that make up an atom, Electron Shells - located on the outermost region of an atom surrounding the nucleus.,

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