Question

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

Rn
Ne
Kr
Ar

Answer 1

Ke is not found in the atmosphere

Answer 2

Hey friend,

Here's your answer,

Among the noble gases, Neon (Ne) , Xenon (Xe), Helium (He), Argon (Ar) and Krypton (Kr) are present in the atmosphere.

Radon (Rn) , which is radioactive in nature, is not present in the atmosphere. This is because the high emissions being emitted by these gases are harmful to sustain life.

Hope this helps!!!