Crazy Chemistry

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Across
  1. 3. Negatively charged elementary particle
  2. 5. any substance that has mass
  3. 7. Quantity of matter that an object contains
  4. 9. chemically the simplest substances
  5. 10. particles that are free to flow
Down
  1. 1. Positively charged elementary particle
  2. 2. carries no electric charge
  3. 4. state of matter consisting of particles that have neither a defined volume nor defined shape
  4. 6. Smallest unit of matter
  5. 8. particles that are packed closely together