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प्रश्न
The noble gas that does not occur in the atmosphere is:
पर्याय
Ne
He
Kr
Ra
MCQ
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उत्तर
Ra
Explanation:
Radon is radioactive and is produced by the decay of radium in rocks and soil, so it is found only in trace amounts near the ground and not as a stable component of the atmosphere like other noble gases which are inert and stable in the air
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