Which noble gas is radioactive and is produced as a decay product of uranium and thorium?

Which noble gas is radioactive and is produced as a decay product of uranium and thorium?
A. Argon
B. Krypton
C. Radon
D. Neon

Correct Option: Answer is C
Argon, Krypton, and Neon are all stable noble gases and not radioactive.
Radon is indeed radioactive and is a decay product of uranium and thorium. It is formed when alpha particles emitted from these elements lose their charge and combine with electrons in the surrounding air.

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