Which family of elements is extremely unreactive under ordinary conditions?

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  1. #xenon
  2. #gases
  3. #valence
  4. #monatomic
  5. #elements
  6. #electron
  7. #group
  8. #noble
  9. #filled
  10. #nature
  11. #therefore
  12. #radon
  13. #argon
  14. #unreactive
  15. #helium
  16. #found
  17. #krypton
  18. #configurations