Atom, The smallest particle of a chemical element that can exist., Molecule, Two or more atoms chemically joined together., Element, A pure substance containing only one type of atom., Compound, A pure substance made of two or more different elements chemically bonded in a fixed ratio., Mixture, Two or more substances combined but not chemically bonded; can be separated physically., Chemical Symbol, A 1 or 2 letter code representing an element (first letter capital)., Chemical Formula, Symbols showing which elements are in a compound and how many atoms of each., Physical Change, changes when no new chemical substances are formed. Can include: change in shape, size, or state, Chemical change, a change that results in at least one new substance being formed due to breaking and forming chemical bonds, reactants, chemical substances used in a chemical reaction. Chemical bonds of the reactants are broken during the chamical reactions., products, new chemical substances that result from a chemical reaction, molecule, one unit out of a substance

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