Chemistry Bonus

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Across
  1. 3. two surfaces or objects joining together
  2. 9. gives off heat
  3. 10. group of elements with similar properties
  4. 13. used to represent a chemical element
  5. 14. chemical link between atoms and ions
  6. 16. negatively charged ion
  7. 17. positively charged ion
  8. 18. study of matter and its interactions
  9. 19. atomic number 17
  10. 20. a known quantity used in the measurement
Down
  1. 1. solid to gas
  2. 2. gas to solid
  3. 4. absorption of heat
  4. 5. heterogeneous mixture of solids in a liquid
  5. 6. unit of measurement, symbol K
  6. 7. a salt of an anion
  7. 8. atomic number 1
  8. 11. atomic number 50
  9. 12. having properties of alkali
  10. 15. chemical substance, neutralizes bases