atom - the smallest unit of an element, proton - the subatomic particle with a positive charge located in the nucleus, neutron - the subatomic particle with no charge located in the nucleus, electron - the subatomic particle with a negative charge that orbits the nucleus, nucleus - the center of an atom , atomic number - the number of protons in an atom, atomic mass - the average number of protons and neutrons in an atom, chemical symbol - the abbreviation of an element on the periodic table, neutral - describes the charge of atom that has equal number of protons and electrons, isotope - a variation of an atom (different number of neutrons), ion - an atom that is charged (different number of electrons)), valence electrons - the electrons that are in the highest energy level, octet rule - atoms prefer to have 8 electrons in their outer shell to be stable, cation - an atom that has lost electrons and become positively charged, anion - an atom that has gained electrons and become negatively charged, ionization - the process of forming an ion,

Atomic Structure

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