elements

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