Element Crossword

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