7.5 CW 1

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Across
  1. 3. an element that is a poor conductor of heat and electricity
  2. 4. the principle that mass is not created or destroyed in a closed system
  3. 6. the force that holds atoms together in a molecule or compound
  4. 7. a vertical column on the periodic table where elements have similar properties
  5. 8. a mixture in which one substance is evenly dissolved in another
  6. 10. a horizontal row on the periodic table
  7. 11. a subatomic particle with a negative charge that moves around the nucleus
  8. 15. a substance made of two or more different elements chemically combined
  9. 18. two or more atoms chemically bonded together
  10. 19. the smallest unit of matter that makes up an element
  11. 20. particles smaller than an atom such as protons, neutrons, and electrons
  12. 22. the branch of science that studies matter and how it changes
Down
  1. 1. a system in which matter can enter or leave
  2. 2. characteristics of matter that can be observed without changing the substance
  3. 3. a subatomic particle with no charge found in the nucleus
  4. 5. a combination of two or more substances that are not chemically bonded
  5. 9. a chart that organizes all known elements by their properties
  6. 12. a pure substance made of only one type of atom
  7. 13. the center of an atom where protons and neutrons are located
  8. 14. the amount of space an object or substance occupies
  9. 16. a system in which matter cannot enter or leave
  10. 17. the amount of mass in a given volume
  11. 21. a subatomic particle with a positive charge found in the nucleus