Chemistry unit study guide

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Across
  1. 3. a reaction that takes in energy
  2. 6. the substance of the result of a chemical reaction
  3. 8. a name given to a horizontal row of elements on the periodic table
  4. 9. a example is helium
  5. 10. a potential pattern of electron density that are formed in an atom
  6. 11. a Russian chemist they created a periodic table and predicted the discovery of seven new elements
  7. 12. a thin layer of this put on another piece of metal
  8. 15. a substance made of of atom that all have the same number of protons
  9. 16. states that mass is neither destroyed or created during a reaction
  10. 20. a two lettered short way to say an element
  11. 22. a subatomic particle with a negative charge
  12. 24. the positive charge in an atom
Down
  1. 1. a element in between a metal and a nonmetal
  2. 2. the number of protons in a nucleus in the atom
  3. 4. the core of an atom
  4. 5. the outer shell of an atom
  5. 7. mass of a atom in a chemical element
  6. 13. a "family" of element in the periodic table
  7. 14. the smallest constituent unit of ordinary matter
  8. 17. a reaction that releases energy
  9. 18. a chemical element that lacks metallic attributes
  10. 19. a group of atoms bonded together
  11. 21. a good conductor of electricity
  12. 23. a subatomic particle that has no net electric charge