P-Block Elements Ques 419

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

[MP PMT 1993]

Options:

A) $ Rn $

B) $ Kr $

C) $ Ne $

D) $ Ar $

Show Answer

Answer:

Correct Answer: A

Solution:

Rn because it is radioactive element obtained by the disintegration of radium $ _{88}Ra^{206}\to _{86}Rn^{202}+ _2He^{4} $



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