Atom/Periodic Table Crossword

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Across
  1. 2. gas, far right
  2. 5. basic building block of all matter
  3. 6. identifies the element, if you change protons, change the element
  4. 10. contains most of the mass in a very small space
  5. 11. earth very reactive and do not occur freely in nature
  6. 12. solid, far left through middle
  7. 13. characteristics that can be observed
  8. 16. fixed shape and volume, doesn't easily change shape
  9. 17. metals that are very reactive and do not occur freely in nature
  10. 18. definite volume, can change shape
  11. 19. rows in the Periodic Table
Down
  1. 1. solid, along zig-zag line
  2. 3. may change but doesn't change the element, no charge, has mass
  3. 4. number number of protons
  4. 7. columns in the Periodic Table
  5. 8. very small particles with little mass, move quickly around the nucleus
  6. 9. based on matter's ability to change into a new, different substance
  7. 10. gas have the maximum number of electrons in their outer shell, don't want to react with other elements
  8. 14. wants to combine with other elements
  9. 15. no definite volume of shape, can change shape