M8 General Chemistry BONUS Crossword Puzzle

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Across
  1. 3. the size of a proton or a neutron
  2. 5. neutral subatomic particles
  3. 7. Group __ are the most stable elements
  4. 11. the area outside an atom's nucleus which contains all of the electrons
  5. 13. cannot be broken down into a simpler substance and have the same chemical properties
  6. 15. have the same number of valence electrons
  7. 16. share characteristics of both metals and nonmetals
  8. 20. the name of the eighteenth group
  9. 21. the basic unit of a chemical element
  10. 22. mainly found on the left side of the periodic table
  11. 24. negative subatomic particles
  12. 26. the sum of an atom's protons and neutrons
  13. 29. sodium and magnesium are in the same __
Down
  1. 1. __ electrons are in the outermost energy shell of an atom
  2. 2. elements in the same group have similar chemical __
  3. 4. The second and third electron shells can hold up to __ electrons each
  4. 6. These subatomic particles determine an atom's degree of reactivity
  5. 8. a graphic organizer of all the known elements in the universe
  6. 9. The first electron shell can hold only __ electrons
  7. 10. used to describe an atom's ability to chemically bond with another atom
  8. 12. The __ indicates the number of molecules in a chemical formula.
  9. 14. positive subatomic particles
  10. 17. The most reactive elements are located in group __.
  11. 18. mainly found on the right side of the periodic table
  12. 19. __ have the same number of energy levels or energy shells
  13. 23. number of protons contained within an atom's nucleus
  14. 25. These subatomic particles determine an atom's identity.
  15. 27. The __ indicates the number of atoms for a specific element in a chemical formula.
  16. 28. oxygen and sulfur are in the same __