Question

Why $H_{2}$ gas is not found in earth's atmosphere?

Answer 1

“Hydrogen” is the most copious element situated in the universe. It comprises about 70% of the “total mass” of the universe and is the most notable element in solar atmosphere. It is also present in higher concentration in planets such as “Jupiter” and “Saturn”.

The most unfortunate fate of hydrogen is that due to its “light weight” and nature, it is present in the earth atmosphere in trace quantity. It is present in atmosphere about “0.15%” by mass.