matter crossword puzzle

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Across
  1. 7. a particle with a negative charge
  2. 10. the smallest particle of an element
  3. 11. the state of matter that has a definite volume and takes the shape of its container
  4. 12. anything that has mass and takes up space
  5. 13. the state of matter that fills up the space of its container
  6. 15. when a liquid turns into a gas
  7. 16. a particle with a positive charge
Down
  1. 1. a type of gas
  2. 2. when a solid turns into a liquid
  3. 3. a pure substance that cannot be Broken down into smaller parts
  4. 4. when a liquid is turned into a solid
  5. 5. when a gas turns into a liquid
  6. 6. a particle with no electrical charge
  7. 8. the state of matter that has a definite volume and mass
  8. 9. the smallest particle
  9. 14. how much something weighs is called...