Chapter 9 Crossword by Katie Hoffman

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Across
  1. 3. _______ number indicates the valance electrons
  2. 8. The designer of the periodic table of elements
  3. 9. Indicates the number of energy levels
  4. 10. Most abundant metal in earth’s crust
Down
  1. 1. Added to toothpaste and drinking water to protect tooth enamel from decay
  2. 2. Group 7A on the periodic table
  3. 4. The number of non metal elements on the periodic table of elements
  4. 5. Found widely in nature-rocks, coral reefs
  5. 6. Can be found in quartz crystal, sand, and glass
  6. 7. Used in blimps, airships, and balloons