Which one of the following noble gases is not found in the atmosphere

1.	Which one of the following noble gases is not found in the atmosphere [MP PMT 1993]
A.	\[Rn\]
B.	\[Kr\]
C.	\[Ne\]
D.	\[Ar\]
Answer» B. \[Kr\]

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Which one of the following noble gases is not found in the atmosphere [MP PMT 1993]

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