chemistry

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Across
  1. 1. free fast moving particles with indefinite volume and shape
  2. 3. has mass or volume
  3. 7. negatively charged particle
  4. 8. the amount of space something takes up
  5. 10. no charge particle
  6. 11. free flowing matter with definite volume
Down
  1. 2. mass weight of an atom
  2. 4. a combination of different particles
  3. 5. positively charged particle
  4. 6. basic building block of every thing
  5. 9. hard rigid particle that only vibrates slightly