Perioidic Table Crossword

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Across
  1. 2. postively charged
  2. 4. mass round to mass #
  3. 8. electrons only the electrons in the outer most shell
  4. 10. negatively charged
  5. 11. mass # - atomic # = # of neutrons
  6. 12. a substance produced during a natural, chemical, or manufacturing process
  7. 13. semi-conductors
  8. 16. a substance that takes part in and undergoes change during a reaction
  9. 19. numbers arranged in groups known as energy levels
Down
  1. 1. verticial columns
  2. 3. little #;indicates the number of atoms of an element
  3. 5. shiny,ductile,good conductors
  4. 6. the big #;multiply all subscripts by the coefficient
  5. 7. the smallest units of an element
  6. 9. dull,brittle,poor conductor
  7. 14. table a table that organizes the known elements by order of increasing atomic #
  8. 15. atomic # = # of protons= # of electrons
  9. 17. formula contains coefficicent and subscript
  10. 18. neutral charge