Science Crossword Puzzle

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Across
  1. 2. state of matter that has no definte shape or volume
  2. 6. amount of stuff
  3. 7. explains changes of state by describing what happens to the particles if energy is removed
  4. 9. the phase change from liquid to gas
  5. 13. the tiny positive particles inside the center of an atom
  6. 15. a table of elements
  7. 17. mostly empty space, the mass comes from protons and neutrons in the nucleus
  8. 18. the tiny neutral particles inside the center of an atom
  9. 20. the phase change from solid to liquid
Down
  1. 1. the phase change from solid to gas
  2. 3. this number tells us how many protons are in a single atom of that element
  3. 4. amount of space
  4. 5. the phase change from gas to liquid
  5. 8. moves around the nucleus in shells (negative)
  6. 10. chemicals made up of only one kind of atom
  7. 11. state of matter that has definite shape and volume
  8. 12. anything that has mass and takes up space
  9. 14. the phase change from liquid to solid
  10. 16. state of matter that has definite volume but not shape
  11. 19. the phase change from gas to solid