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.

Atomic Structure

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