crossword by Anna and rohan

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Across
  1. 2. 231.9C
  2. 6. is 4.5 times heavier than air
  3. 10. the surface of Mars is red because of it
  4. 11. named after a planet
  5. 12. Tom dexon
  6. 14. polypropylene oxide
  7. 15. thallotoxicosis
Down
  1. 1. unknown one of the most new and elusive ones
  2. 3. the largest lived isotope
  3. 4. in lungs
  4. 5. Na
  5. 7. highly radioactive synthetic and unstable
  6. 8. its a solid that turns into a purple gas
  7. 9. 115.21C
  8. 13. the least durable Minecraft armor