ELI - Chemistry Crossword Puzzle

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Across
  1. 7. The backbone of modern infrastructure; its abundance in Earth’s crust and ability to form strong alloys make it indispensable.
  2. 8. It is the second most abundant atmospheric gas.
  3. 9. A noble gas used in welding and LED lighting.
  4. 10. Essential for wiring and plumbing, no house can do without it.
  5. 11. Without it no organic matter exists.
  6. 13. Used in Teflon production and specialty chemical manufacturing.
  7. 14. Essential for semiconductors, glass, etc.
  8. 16. Used in lightweight alloys for aerospace, automotive parts, and electronics due to its good strength and low density.
  9. 17. The most abundant metal in Earth’s crust.
  10. 18. Used in high voltage indicators and lasers.
  11. 19. Although reactive, its solid compounds are used in glassmaking and food processing. Hint: its chemical symbol does not contain any of the letters in its name.
Down
  1. 1. It makes up 78% of Earth’s atmosphere.
  2. 2. Used in insulating gas mixtures for energy efficient windows as well as airport runway lights.
  3. 3. Its compounds are key agriculture.
  4. 4. Used in ammonia production and emerging clean energy technologies (fuel cells).
  5. 5. On earth, it is used in medical imaging; in space, it is used for ion propulsion systems in spacecraft.
  6. 6. A major component of limestone as well as concrete
  7. 10. Used in water purification and disinfectants - although toxic, it is industrially indispensable.
  8. 12. Valued for its high corrosion resistance and strength to weight ratio, used in aerospace, medical implants, and high performance alloys.
  9. 15. Essential for MRI machines, cryogenics, leak detection, and scientific research.