Periodic Table Crossword

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Across
  1. 1. neutral charge
  2. 4. table a table that organizes the known elements by order of increasing atomic #
  3. 6. number # of protons in the nucleus of one atom of an element
  4. 7. semi-conductors
  5. 8. little # l indicates the number of atoms of an element
  6. 10. positively charged
  7. 11. formula contains coefficient and subscript
  8. 13. dull,brittle,poor conductors
  9. 14. mass round to mass #
  10. 17. mass # -atomic # = # of neutrons
  11. 19. the smallest unit of an element
  12. 20. numbers # of energy levels
Down
  1. 2. negatively charged
  2. 3. substances we start with in a chemical reaction
  3. 5. the big #;multiply all subscripts by this
  4. 9. new substances created in a reaction
  5. 12. electrons only the electrons in the outer most shell
  6. 15. shiny,ductile,good conductors
  7. 16. atomic # = # of protons= # of electrons
  8. 18. vertical columns