Chemistry

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Across
  1. 2. Pure substances
  2. 3. Negative
  3. 6. absolute
  4. 7. Gases
  5. 10. tendency
  6. 11. UNIT formula
  7. 14. electron
  8. 16. Nucleus
Down
  1. 1. covalent
  2. 4. Atoms
  3. 5. Chemical
  4. 8. eight electrons
  5. 9. Particles
  6. 12. Element
  7. 13. Elements
  8. 15. positive