Periodic Table Crossword

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Across
  1. 3. It's element symbol is also a prefix that means "two".
  2. 5. A metalloid commonly found in rat poison.
  3. 6. Element symbol of Ga.
  4. 8. Element symbol of Cl.
  5. 10. Element symbol of Cd.
  6. 13. A noble gas that shares a name with Superman's home planet.
  7. 14. 39 protons.
  8. 16. This is the last element on the periodic table.
  9. 19. 30 protons.
  10. 20. This alkali metal is one of two elements in salt.
Down
  1. 1. Element symbol of K.
  2. 2. This nonmetal makes up 78% of the earth's atmosphere.
  3. 4. The alkaline earth metal with the biggest atomic number.
  4. 7. Shares a name with the planet closest to the sun.
  5. 9. This is the first element on the periodic table.
  6. 11. 53 protons.
  7. 12. This transition metal is also a shade of blue.
  8. 15. The post-transition metal with the least protons.
  9. 17. 14 protons.
  10. 18. 89 protons.