Cation - positive ion with fewer electrons than protons, Anion - negative ion with more electrons than protons, Average atomic mass - weighted average of all of the naturally occurring isotopes of an element, Atom - Smallest part of an element that has all the properties of that element, Ion - Charged particle, Electron - Negatively charged particle (-1) found outside of the nucleus, Proton - subatomic particle with +1 charge and mass of 1amu, Neutron - subatomic particle with no charge but mass of 1amu, Element - pure substance made of only one atom type, Nucleon - subatomic particles found in the nucleus, Mass Number - Number of protons and neutrons in an element, Atomic Number - Number of protons in an element, Isotope - Atoms of an element with the same number of protons but differing numbers of neutrons (different mass number), Percent Abundance - The percentage of the naturally occurring isotopes of that element, Nuclide, Alpha particle - positively charged particles used as part of the gold foil experiment, Gold Foil Experiment - demonstrated that atoms are mostly empty space with a tiny, dense, positively charged nucleus at the center, Cathode Ray Tube Experiment - Noticed that cathode rays contain particles that are deflected by negative charge, indicating that those particles are negatively charged themselves, Dalton Model of the Atom - Cannonball model, indivisible sphere, Thomson Model of the atom - Plum Pudding Model with electrons, Rutherford Model of the Atom - Nuclear model, Plum Pudding Model (blueberry muffin) - electrons stuck throughout a positively charged atom, Cannonball model - Dalton's model, Nuclear Model - Rutherford model, Electron charge - -1, Proton charge - +1, Neutron charge - 0, Nucleus - Center of an atom, Periodic Table - Element arrangement chart, Compound - Two or more elements chemically bonded together in a fixed ratio,

Atomic Theory Terms

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