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