Periodic Table

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Across
  1. 2. oxygen and sulfur are in the same
  2. 4. used to describe an atom's ability to chemically bond with another atom
  3. 6. mostly found on the right side of the periodic table
  4. 8. cannot be broken down into a simpler substance and have the same chemical properties
  5. 10. a graphic organizer of all the known elements in the universe
  6. 11. share characteristics of both metals and non-metals
Down
  1. 1. group ______ are the most stable elements
  2. 3. ________ electrons are in the outermost energy shell of an atom
  3. 5. have the same number of energy levels or energy shells
  4. 7. mostly found on the left side of the periodic table
  5. 9. group ____ are the most reactive elements on the periodic table
  6. 10. sodium and magnesium are in the same _____
  7. 12. the basic unit of a chemical element