Periodic Table Crossword

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Across
  1. 3. The element that is abbreviated by Pt
  2. 5. Group Eight
  3. 8. The element that Group Three was named after
  4. 9. Group Five
  5. 12. Alkaline Earth Metals
  6. 15. Proton number of three
  7. 16. Group Four
  8. 18. The number of groups in the periodic table
  9. 19. Group Seven
Down
  1. 1. Atoms that want to have eight _____
  2. 2. The element with the smallest mass number
  3. 4. Group One
  4. 6. The number of rows in the periodic table
  5. 7. Group Three
  6. 10. The element that Group Four was named after
  7. 11. The element that is abbreviated by K
  8. 13. Group Six
  9. 14. Radioactive element with a mass number of 238
  10. 17. The element that is abbreviated by Pb
  11. 20. Na abbreviates this element