Question

Which is the most abundant inert gas in the atmosphere of earth?

Answer 1

Air is almost 1% argon, formed from the radioactive decay of potassium 40 in the earth's crust. The second most abundant inert gas is helium, which is present in percent levels in natural gas in some areas. Helium is formed from alpha decay of uranium and thorium in the crustal rocks.

Answer 2

Argon is the most abundant noble gas in atmosphere.