# The noble gas that does NOT occur in the atmosphere is :Option 1)$He$Option 2)$Kr$Option 3)$Ne$Option 4)Rn

$He,Ne,Kr$ 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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