Chemistry words

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Across
  1. 3. a form of exothermic reaction that produces both light and heat
  2. 5. the way chemists and physicists organize the elements
  3. 8. often produces light and heat
  4. 13. the number of protons in an element
  5. 15. building blocks of the universe
  6. 16. alkali _____
  7. 17. subatomic particle that has a negative charge
  8. 18. subatomic particle without a charge
Down
  1. 1. the mass of an atom of any given element
  2. 2. changes form but not properties
  3. 4. a group of 2 or more atoms held together by chemical bonds
  4. 6. a group of metals that react violently with water
  5. 7. can be easily separated
  6. 9. uses light and heat to function
  7. 10. subatomic particle with a positive charge
  8. 11. reaction produces light and heat
  9. 12. not a metal
  10. 14. 2 substances that are unable to easily be separated