science review crossword puzzle

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Across
  1. 4. a solid that forms between two liquids
  2. 5. flammable may ignite if exposed
  3. 7. the amount of space an object takes up
  4. 8. the guy who organized the periodic table
  5. 9. two or more substances are visible
  6. 11. the most reactive metal group
  7. 15. a subatomic particle that is negative
  8. 16. feeling, seeing, smelling
  9. 18. a subatomic particle that is neutral
  10. 19. non metals that do not react
  11. 20. ability to stay unchanged
  12. 21. how easy it is to bend
  13. 22. the rings that surround the nucleus
  14. 25. a subatomic particle that is positive
  15. 27. how able it is to hammer it into a sheet
  16. 28. particles are very close together
  17. 29. state of matter with least attraction
Down
  1. 1. the last energy level in an atom
  2. 2. numbers, measuring, fixed value
  3. 3. reacts with oxygen
  4. 6. means unstable
  5. 10. there on the periodic table
  6. 12. mass/volume =
  7. 13. negative ion
  8. 14. from gas to solid state
  9. 17. from solid to liquid
  10. 23. solid, shiny, good conductor
  11. 24. from liquid to solid
  12. 26. positive ion
  13. 30. smallest particle of an element