Proton - Positive subatomic particle in atomic nucleus, Electron - Negative subatomic particle in electron cloud, Neutron - Neutral subatomic particle in atomic nucleus, Nucleus - Where protons & neutrons are found, Electron cloud - Where electrons are found, Atom - The smallest part of an element, Atomic number - The quantity of protons in the nucleus of an atom, Mass number - The number of protons & neutrons in an atom, Periodic table - Arrangement of chemical elements according to their atomic #, Valence electron - The number of electrons found on the outer energy level of an atom,

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