Periodic Table Crossword

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Across
  1. 3. determines the number of valence electrons
  2. 8. the principle that the properties or characteristics of the elements recur periodically as their atomic numbers increase
  3. 10. the number of protons in an atom's nucleus
  4. 11. substance composed of atoms with different atomic numbers
  5. 13. conduct heat and electricity, are shiny, and can be hammered into sheets or drawn into a wire
  6. 14. groups 3 through 12 and the lanthanides and actinides
  7. 16. average quantity of matter that an atom of that element contains
  8. 18. notation of one or two letters that represents a chemical element
  9. 23. physical properties and appearances like metals, chemical properties like non-metals
  10. 24. horizontal row of the periodic table
  11. 25. able to be shaped or flattened into a thin sheet
Down
  1. 1. material that conducts heat or electricity
  2. 2. group 18, generally very stable, colorless, and odorless
  3. 4. table of the chemical elements arranged in order of atomic number
  4. 5. substance composed of atoms with the same atomic number
  5. 6. another word for group
  6. 7. chemicals that do not conduct heat and electricity, are not shiny, and cannot be hammered into sheets or drawn into a wire
  7. 9. 'fixer' of the periodic table, organised it by atomic number
  8. 12. maker of the periodic table, but organised it by mass
  9. 15. the tendency of a substance to undergo chemical reaction by losing or gaining electron(s)
  10. 17. first group of the periodic table
  11. 19. metals the second group of the periodic table
  12. 20. group 17 of the periodic table
  13. 21. vertical column of elements in the periodic table
  14. 22. able to be stretched into a thin wire