Groups and Periods

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