Chemistry Review

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Across
  1. 5. rule that the cloud needs eight electrons
  2. 6. molecules are spread out
  3. 9. shows number of atoms in a compound
  4. 10. formulas to the left of the arrow
  5. 12. big number in front of chemical formula
  6. 15. two or more elements bonded together
  7. 16. pure substance located on the periodic table
  8. 18. when atoms rearrange to form a new substance
  9. 20. shows reactants forming products
  10. 21. molecules slide past each other
  11. 22. small number on the bottom of the formula
Down
  1. 1. electrons located in the outermost shell
  2. 2. determines the element's identity (two words)
  3. 3. two or more elements bonded together may be same or different
  4. 4. positively charged particle
  5. 7. molecules are tightly packed
  6. 8. things formed after a chemical reaction
  7. 11. located in center of atom
  8. 13. neutral charged particle
  9. 14. rows on the periodic table
  10. 15. area outside the nucleus
  11. 17. columns on the periodic table
  12. 19. negatively charged particle