The first 20 elements

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Across
  1. 2. it is found in meteorites, volcanoes,and hot springs
  2. 6. found in bananas
  3. 8. the most electronegative and reactive of all elements
  4. 9. the 18th element on the periodic table
  5. 10. in a vacuum discharge tube, it glows reddish orange
  6. 11. the 15th element on the periodic table
  7. 15. your breathing it at the moment
  8. 16. the least dense metal
  9. 18. 78% of the atmosphere is made of it
  10. 19. its what makes orange street lights glow
Down
  1. 1. when inhaeled your voice goes funny
  2. 2. it is present in the sun and stars and of a class of meteorites
  3. 3. very toxic and can scratch glass
  4. 4. its in pools
  5. 5. the 5th element on the periodic table
  6. 7. when burnt it pruduces a very bright light
  7. 12. the lightest element
  8. 13. needed to keep your bones strong
  9. 14. it is easily formed, machined, and decorative
  10. 17. diamonds are made of this element