What are the four main groups in the periodic table?

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  1. #oxygen
  2. #fluorine
  3. #elements
  4. #table
  5. #atomic
  6. #lightest
  7. #arranged
  8. #beryllium
  9. #carbon
  10. #physics
  11. #group
  12. #periodic
  13. #members
  14. #represented
  15. #helium
  16. #chemistry
  17. #boron
  18. #whose
  19. #nitrogen
  20. #lithium