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All of the following noble gases are present in the atmosphere, except1. Helium2. Xenon3. Argon 4. Radon

Answer» Correct Answer - Option 4 : Radon

The correct solution is Radon.

  • In the Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, 0.9 % argon, and 0.1 % other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 %
  • Trace amounts of neon, helium, methane, krypton, and hydrogen, as well as water vapor.
  • Radon is a naturally-occurring radioactive gas that can cause lung cancer.
  • Radon gas is inert, colorless, and odorless. 
  • Radon is the second leading cause of lung cancer in the United States. 

  • The six naturally occurring noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).


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