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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