7.5 CW 2

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