Science

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Across
  1. 4. it's in your bones and milk
  2. 7. there's a doctor named this in the DC universe
  3. 11. is the lightest element
  4. 12. was the thing powering iron man's mini arc reactor in Iron Man 2
  5. 15. there are two kinds of this; the element and the one on your pencil
  6. 16. an element and the name of a fictional planet
  7. 17. 2nd strongest metal in the world
  8. 19. 28th element and the name of our classmate
Down
  1. 1. you can find this in a banana
  2. 2. you often find cans made of this
  3. 3. is very poisonous
  4. 5. you often find this in a pool
  5. 6. are odourless, colourless and are a group of gases
  6. 8. You need this to live
  7. 9. shiny and highly treasured
  8. 10. has the highest melting point
  9. 11. Chemical formula for water
  10. 13. melts at room temperature
  11. 14. sounds like a the titan that gave fire to humans
  12. 18. it's neon