[{"term": "Atom", "definition": "The smallest unit of an element that retains the properties of that element."}, {"term": "Element", "definition": "A pure substance made of only one type of atom."}, {"term": "Compound", "definition": "A substance made of two or more elements chemically bonded together."}, {"term": "Molecule", "definition": "Two or more atoms bonded together."}, {"term": "Chemical Reaction", "definition": "A process where substances (reactants) change into new substances (products)."}, {"term": "Periodic Table", "definition": "An organized chart of all known elements arranged by atomic number."}]