Question

Why is oxygen not the most abundant gas in the atmosphere?

Answer 1

By far the predominant gas is carbon dioxide, making up 95.9 percent of the atmosphere's volume. The next four most abundant gases are argon, nitrogen, oxygen and carbon monoxide.

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Answer 2

Answer:

Compared to Oxygen, Nitrogen is 4 times as abundant in the atmosphere. Here is why Nitrogen is more abundant in the atmosphere:

Of course, we must also consider the relative abundances of Oxygen and Nitrogen over the entire Earth (oxygen is about 10,000 times more abundant).  Oxygen is a major component of the solid earth, along with Si and elements such as Mg, Ca and Na. Nitrogen is not stable as a part of a crystal lattice, so it is not incorporated into the solid Earth, so it is not incorporated into the solid Earth. This is one reason why nitrogen is so enriched in the atmosphere relative to oxygen. The other primary reason is that, unlike oxygen, nitrogen is very stable in the atmosphere and is not involved to a great extent in chemical reactions that occur there. Thus, over geological time, it has built up in the atmosphere to a much greater extent than oxygen.