Chemistry

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Across
  1. 3. number of protons
  2. 6. determines the elements reactivity
  3. 7. has a charge of 0
  4. 9. have similar chemical properties
  5. 11. is located in the center of an atom
  6. 12. has a negative charge
  7. 13. where electrons are located
  8. 16. Average mass of all isotopes (varieties) of that element
  9. 17. determines how many energy levels an atom has
  10. 18. full outer shell,low reactivity,all part of group 8
  11. 19. bottom left corner
  12. 20. charged atoms
Down
  1. 1. high shine,good conductor,malleable
  2. 2. calculated by mass#-atomic#
  3. 4. determines the # of electrons in elements outer shell
  4. 5. positive charge
  5. 8. forms between two nonmetals atoms of the same element
  6. 10. shares properties of both metals and nonmetals
  7. 14. of elements are called periods
  8. 15. dull,low shine,poor conductor,breakable