1) Only one type of atom a) Elements b) Compounds 2) Metal and Nonmetal Bonding a) Ionic b) Covalent 3) Pure substance of one type of atom a) Elements b) Compounds 4) Made of molecules of two or more elements a) Elements b) Compounds 5) Chemically combined a) Elements b) Compounds 6) Chemical formula a) Elements b) Compounds 7) Nonmetal and Nonmetal Bonding a) Ionic b) Covalent 8) Chemical symbol a) Elements b) Compounds 9) Metal and Nonmetal Bonding a) Ionic b) Covalent 10) Percentage of Nitrogen in atmosphere ? a) 78% b) 21%

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