The noble gas not found in the atmosphere is

Question

The noble gas not found in the atmosphere is (A) He (B) Kr (C) As (D) Rn

Tardigrade Admin · Accepted Answer

Due to the inert nature, noble gases always occur in the free state. Except radon (Rn), all these gases are present in atmosphere in the atomic state. Radon is radioactive and does not occur in the free state because it decays very rapidly.

Q. The noble gas not found in the atmosphere is

He

Kr

As

Rn

Due to the inert nature, noble gases always occur in the free state. Except radon $(R n)$ , all these gases are present in atmosphere in the atomic state. Radon is radioactive and does not occur in the free state because it decays very rapidly.