Elements of the Periodic Table

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Across
  1. 2. Element named for European country not independent at the time it was discovered
  2. 4. Radioactive noble gas
  3. 5. Common dissolved element in seawater that increases with depth due to dissolution of foraminfera
  4. 7. Element with an isotope that can be used for dating up to 50,000 years
  5. 8. Artificial element that is soluble in seawater, released from plutonium re-processing facilities in Britain and France and can serve as a tracer
  6. 10. Natural element that has a long-lived radioisotope that is used as a conservative seawater tracer and is also concentrated by marine algae
  7. 11. Name of element whose nucleus is also an alpha particle
  8. 12. Element named after the major planet furthest from the Sun
  9. 13. Rare metal named in honor of a country with three colors on its flag
  10. 14. Particle-reactive element with no stable isotopes
  11. 16. One of the elements in beach sand
  12. 18. Element remaining at the end of the uranium decay series
  13. 19. Element named for Norse god
Down
  1. 1. Element that is contributing to pollution from Fukushima (use American, rather than British spelling)
  2. 2. Element that is source of largest radioactivity burden for seafood eaters
  3. 3. Element with no stable isotopes that has a conservative water column profile
  4. 6. Artificial metal named in honor of a country with three colors on its flag
  5. 9. Metal that increases in concentration with depth due to hydrothermal vent activity
  6. 15. Dissolved gas missing from the bottom of the Arabian Sea
  7. 17. Poisonous metal that is taken up by phytoplankton and shows a similar distribution as does phosphate
  8. 20. Dissolved gas with a subsurface or surface maximum