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Question

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

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> JEE MAINS 2019

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Solution

Helium is present in the atmosphere at 5.24 ppm concentration.
Neon is present in the atmosphere at 18.2 ppm in concentration.
Krypton is present in the atmosphere at 0.087 ppm in concentration.
First of all radium is not a noble gas and it is not available in nature. So, option d is correct.

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