molecule - 2 or more atoms held together by chemical bonds, compound - combination of 2 or more bonded elements, element - pure substance represented by chemical symbols, classify - putting into groups or categories by characteristics, atom - the smallest part of a chemical element, pure substance - made of only 1 type of atom or molecule , chemical symbol - one or two letters that represent an element, matter - anything that has mass and takes up space, water - common name for the compound H2O, sulfur - element represented by the chemical symbol "S", CO2 - chemical formula for carbon dioxide, NaCl - chemical formula for table salt (sodium chloride), He - chemical symbol for helium ,

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