What are the 18 groups on the periodic table?

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Tags

  1. #radon
  2. #monatomic
  3. #called
  4. #gases
  5. #helium
  6. #argon
  7. #single
  8. #composed
  9. #krypton
  10. #group
  11. #xenon
  12. #atoms
  13. #because
  14. #noble