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Which is the most abundant gas Oxygen, Nitrogen or Carbon-di-oxide?

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Nitrogen is by far the most abundant gas in the Earth's atmosphere, accounting for around 78% of the mass of dry air. The second most abundant gas is Oxygen, which makes up 20 to 21% of the atmosphere and that leaves Carbon-dioxide with the least abundant gas in the atmosphere.
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Nitrogen is the most abundant gas in the atmosphere followed by Oxygen and Carbon

dioxide.

The proportions of Oxygen and Carbon dioxide are stabilized by photosynthesis process of the plants in presence of Sunlight during the day when Nitrogen is taken up by the plants.
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Gases:-

The most abundant naturally occuring gas is Nitrogen (N2). Which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas Argon (Ar) is the third most abundant gas at.
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Nitrogen is the most abundant gas comprising of over 78 percent in the Air. Oxygen is the second most abundance gas making up 21 percent of Air.  The third most abundant gas is Argon. Although there are other gases in Air mixture the composition is smaller. 
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