Periodic Table of Elements

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Across
  1. 2. Valuable, heavy, and not that rare
  2. 5. Latest discovered element. Formally Ununoctium
  3. 8. The air we breathe
  4. 9. This + Chlorine makes salt
  5. 10. Rare and radioactive
Down
  1. 1. Highly toxic. Discovered by Marie Curie
  2. 3. BANANA!!!
  3. 4. A Halogen found in toothpaste
  4. 6. Glows brightly, let isn't very reactive
  5. 7. Found in seawater and some fish