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Which one of the following noble gases i...

Which one of the following noble gases is not found in atmoshphere?

A

`Rn`

B

`Kr`

C

`Ne`

D

`Ar`

Text Solution

Verified by Experts

The correct Answer is:
A
Rn because it is radioactive element obtained by the disintegration of radium
`._(88)Ra^(206)rarr ._(86)Rn^(202)._(2)He^(4)`
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