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} $