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Which of the following noble gases do not occur in the elemental state in the atmosphere?

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in Chemistry – Class 12 by (188k points)
Which of the following noble gases do not occur in the elemental state in the atmosphere?

(a) Helium

(b) Neon

(c) Argon

(d) Radon

I have been asked this question in an internship interview.

This is a very interesting question from P-Block in portion P-Block Elements of Chemistry – Class 12

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Right answer is (d) Radon

Explanation: Radon is the last-named member of the 18^th group of elements in the periodic table. It is radioactive in natureand as a result, all other noble gases except radon occur in the elemental state in the atmosphere.

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