Those Crazy Elements

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Across
  1. 4. the rows across the periodic table are called
  2. 5. element that you breathe in
  3. 6. molecule that is made up of two atoms
  4. 7. the creator of the periodic table
  5. 8. a element found in tooth paste
  6. 10. dull and brittle are properties of
  7. 12. what is the chemical symbol for Potassium?
  8. 13. the creator of the idea of the first atomic theory
  9. 14. a extremely dangerous gas
  10. 15. the average massif all the isotopes of an element is called
Down
  1. 1. what is k the chemical symbol for?
  2. 2. another name for a family in the periodic table
  3. 3. shiny and malleable are properties of
  4. 9. a element that makes up about 78% of Earths atmosphere by volume
  5. 11. the most reactive elements in the periodic table
  6. 16. the only nonmetal in group 14