Periodic Table Fun!

1234567891011121314151617
Across
  1. 3. I am denser than iron
  2. 6. A very bad ingredient in watches
  3. 8. My element's name comes from Argentina
  4. 9. I've got 176 neutrons!!
  5. 11. You'll find me in a nuclear submarine
  6. 13. I am in your foil -- in England
  7. 15. I'm named for Poland
  8. 16. Don't fly with me in batteries
  9. 17. I'm quite explosive in fireworks
Down
  1. 1. I make up the Sun
  2. 2. I don't have any neutrons!
  3. 4. I don't know WHY I start with W
  4. 5. I'm found in emeralds
  5. 7. I am the rarest element!
  6. 10. Don't try to eat soup with me
  7. 12. I'm a little controversial, because my namesake was still alive!
  8. 14. I'm found in spark plugs and in meteors