Chemistry Extra Credit Crossword

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Across
  1. 3. ____ reaction; always yields carbon dioxide and water
  2. 4. _____ composition; the percentage by most of each element in a compound
  3. 6. ____ composition; percentage by most of each element in a compound
  4. 10. relationships among the reactants and products involved in a chemical reaction
  5. 14. central core of an atom
  6. 17. substance that initiates or speeds up a chemical reaction
  7. 18. Gilbert_____; American chemist who proposed the "octet rule"
  8. 19. counting unit which represents Avogadro's number of particles/ojects
  9. 20. element with an atomic number of 92
  10. 22. element with the symbol Xe
Down
  1. 1. _____ reaction; example: AB>A+B
  2. 2. Subatomic particle with a positive charge
  3. 5. chemical_____; recipe for chemical reaction
  4. 7. _____ reagent; reactant in a chemical reaction which is left over
  5. 8. ____mass; total mass of all the elements in a compound (in grams)
  6. 9. element with an atomic weight of 1.0079
  7. 11. _____ bond; bond in which two atoms transfer valance electrons
  8. 12. Group 17 on periodic table
  9. 13. element with an atomic number of 78
  10. 15. electron____; surrounds nucleus in an atom
  11. 16. element with an atomic number of 14
  12. 17. Ion that has lost electron(s)
  13. 21. Ion that has gained electron(s)