Groups and Periods of the First 20 Elements

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Across
  1. 2. group 13 period 2
  2. 7. elements in the same period have the same number of these
  3. 9. group 17 period 3
  4. 10. group 14 period 2
  5. 15. name for the horizontal rows of the periodic table
  6. 16. group 2 period 2
  7. 17. group 1 period 4
  8. 18. group 13 period 3
  9. 19. ground 1 period 3
  10. 20. group 1 period 1
  11. 22. group 2 period 3
  12. 24. group 18 period 1
Down
  1. 1. group 18 period 3
  2. 3. group 15 period 2
  3. 4. elements in the same group have the same number of these
  4. 5. group 17 period 2
  5. 6. group 18 period 2
  6. 8. group 2 period 4
  7. 11. group 16 period 2
  8. 12. group 15 period 3
  9. 13. group 16 period 3
  10. 14. group 14 period 3
  11. 21. group 1 period 2
  12. 23. name for the vertical columns of the periodic table