The noble gas that does NOT occur in the atmosphere is :

  • Option 1)

    He

  • Option 2)

    Kr

  • Option 3)

    Ne

  • Option 4)

    Rn

Answers (1)

He,Ne,Kr are present in atmosphere  but "Rn" is not present in atmosphere 

[Reason :- option should be "Rn" not "Ra" because "Ra" is not noble gas]


Option 1)

He

Option 2)

Kr

Option 3)

Ne

Option 4)

Rn

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