2.A pure substance containing only one kind of atom. A. element B. mixture C. compound D. solution


3.Contains two or more elements chemically combined. A. elements B. compound C. mixtures D. solution


4. When two or more elements chemically combine. A. element B. compound C. mixture D. solution


5. Which of these is the correct symbol for magnesium. A. MG B. mg C. Mg D. Ma ​