The Periodic Table

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Across
  1. 3. This is used in fluoride toothpaste
  2. 6. People use this in their OPEN signs at the store
  3. 7. This is used on some watches
  4. 10. This is superman's home planet
  5. 12. This highly poisonous
  6. 14. This is used in many pencils
  7. 15. This killed soldiers in WWI
  8. 16. We spend this at the store
  9. 18. This is what we use every day
  10. 20. This what many people like and is used in some rings
Down
  1. 1. This used in keys and some expensive pens
  2. 2. This is used in photographic flashes
  3. 4. This what we use to make balloons float
  4. 5. Is incredibly useful in industry for wiring, heat sinks and coins
  5. 8. This gas makes up 78% of the atmosphere
  6. 9. By weight, 75% of the visible universe is this
  7. 11. This is what we breath in
  8. 13. We use this in some bracelet
  9. 17. This is an invisible, radioactive gas
  10. 19. This is used in horseshoes