CHEMISTRY UNIT REVIEW CROSSWORD

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Across
  1. 6. rings around a nucleus that can have zero, one, or two electrons
  2. 8. Has a neutral charge (no charge)
  3. 9. A process that requires absorbed heat
  4. 11. the P.T.): one of the Horizontal rows on the Periodic Table
  5. 13. An electron that helps form a chemical bond
  6. 15. Has a negative charge
  7. 16. The number of protons in a atom
  8. 18. An element that has both properties of a metal and a nonmetal
  9. 20. Its made from a single type of atom and is a pure substance
  10. 21. The mass of a chemical elements atoms
  11. 23. letters standing for a chemical element
  12. 25. Gas: Include helium, neon, argon, krypton, xenon, and radon
Down
  1. 1. Man who discovered the Periodic Law
  2. 2. States that mass is neither created nor destroyed by chemical reactions or physical transformations.
  3. 3. the Result of a chemical reaction
  4. 4. the P.T.): A numbered column on the Periodic table
  5. 5. A process with released heat
  6. 7. Is formed after 2 or more elements are chemically bonded
  7. 10. An element that isn't a metal
  8. 12. A solid that is hard, shiny, malleable, fusible, and ductile
  9. 14. The brain or powerhouse of a cell
  10. 17. A substance that changes during a chemical reaction
  11. 19. Has a positive charge
  12. 22. Groups of atoms bonded together
  13. 24. Everything is made from this.