1. Tardigrade
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  3. Chemistry
  4. The noble gas not found in the atmosphere is

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Q. The noble gas not found in the atmosphere is

AMUAMU 2011

Solution:

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.