The elements

123456789101112131415161718192021222324252627282930313233343536
Across
  1. 4. First artificially synthesized element
  2. 7. Strengthens your bones
  3. 8. Very corrosive
  4. 12. Found in matches
  5. 14. Used in atomic bombs
  6. 17. Vital to life
  7. 18. Most abundant element in the universe
  8. 19. Named after Einstein
  9. 20. One of the two liquid elements
  10. 21. First radioactive element
  11. 23. Created in stars
  12. 25. The most dangerous element
  13. 26. Used to be used to cure furs
  14. 27. Used in balloons
  15. 28. Sometimes used in nuclear power
  16. 30. Victorian poison
  17. 33. Used in yellow fireworks
  18. 34. A composer of Bronze
  19. 36. Named after the planet in "Superman"
Down
  1. 1. Used to create green fireworks
  2. 2. Has a series named after it
  3. 3. Sounds like "think"
  4. 5. 118th element
  5. 6. Smells like rotten eggs
  6. 7. Used in car parts
  7. 9. Used in pools
  8. 10. Main composer of air
  9. 11. Named after the creator of the periodic table
  10. 13. Used to make red fireworks
  11. 15. Named after one of the western states of USA
  12. 16. Named after the Roman sea god
  13. 22. Used in plane parts
  14. 24. Similar to Arsenic
  15. 29. Most radioactive element
  16. 31. Used in Silicone
  17. 32. Named after Marie Curie
  18. 35. Diamond is one of its forms