Periodic Table Crossword Puzzle

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Across
  1. 3. Group 1 Period 7
  2. 9. Group 14 Period 5
  3. 11. Group 17 Period 3
  4. 12. Group 18 Period 1
  5. 14. Group 9 Period 4
  6. 15. Group 15 Period 6
  7. 18. Group 8 Period 6
  8. 20. Group 2 Period 5
  9. 21. Group 7 Period 4
  10. 22. Group 13 Period 4
  11. 23. Group 13 Period 2
Down
  1. 1. Group 1 Period 6
  2. 2. Group 18 Period 5
  3. 4. Group 4 Period 7
  4. 5. Group 3 Period 5
  5. 6. Group 2 Period 2
  6. 7. Group 13 Period 3
  7. 8. Group 11 Period 6
  8. 10. Group 16 Period 4
  9. 13. Group 18 Period 6
  10. 16. Group 1 Period 1
  11. 17. Group 12 Period 4
  12. 19. Group 8 Period 4
  13. 20. Group 16 Period 3