Periodic Table Crossword

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Across
  1. 3. An inert noble gas used to prevent electronics from oxidating.
  2. 5. An alkaline earth metal with many uses in the body.
  3. 8. This element is 78 percent of earth's atmosphere.
  4. 9. Used often in balloons for their longevity.
  5. 10. Basic building block of all life.
  6. 11. A bright yellow nonmetallic element with a rotten smell.
  7. 13. A soft white metal that is vital in the human body.
  8. 16. Used in batteries.
  9. 17. A flammable gas that we breathe.
  10. 18. Used in semiconductors or electronics.
  11. 19. Has an atomic number of 20.
Down
  1. 1. A non metallic structural component in plant cell walls.
  2. 2. A brittle but strong metal that does not appear in nature by itself.
  3. 4. A highly reactive element that is not found in nature.
  4. 6. Used in glowing signs.
  5. 7. Has an atomic mass of 39.098.
  6. 9. Used in analytical chemistry for its ability to produce clean flames.
  7. 12. The most electronegative element.
  8. 14. The most common metal in earth's crust. This element is highly conductive.
  9. 15. Used to remove germs and gaseous at room temperature.