Atom - The smallest particle of an element that retains the element's properties., Nucleus - Positively charged center of an atom., Protons - Particles with an electric charge of 1+., Neutrons - Electrically neutral particles in the nucleus; they do not have a charge., Electrons - Particles with an electric charge of 1-., Quarks - Protons and neutrons are composted of these smaller particles., Electron Cloud - The area around the nucleus of an atom, where electrons are most likely to be found., Atomic Number - The number of protons in an atom's nucleus is equal to its _______________., Mass Number - The sum of the number of protons and the number of neutrons in the nucleus of the atom., Isotopes - Atoms of the same element that have different numbers of neutrons., Average atomic mass - The weighted average, Periodic Table - Elements are arranged by increasing atomic number - not atomic mass - and by periodic changes in physical and chemical properties., Periods - The horizontal rows of elements in the periodic table., Groups - The vertical columns in the periodic table., Electron Dot Diagram - Consists of the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level.,

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