Which one of the following gases is found in highest quantity in

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Which one of the following gases is found in highest quantity in Exosphere?

Hydrogen
Helium
Nitrogen
Oxygen
This question was previously asked in
UPSC NDA-2 – 2015
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The correct option is A, Hydrogen.
The exosphere is the outermost layer of the Earth’s atmosphere, extending upwards from the thermosphere and gradually thinning into space. The gases in this region are extremely sparse. Due to their very low atomic mass, hydrogen and helium are the most abundant constituents, as they are light enough to reach these high altitudes and potentially escape Earth’s gravity. Hydrogen is generally considered the dominant gas in the outermost reaches of the exosphere. Heavier gases like nitrogen and oxygen are much more concentrated in the lower atmospheric layers.
The exosphere is characterized by extremely low density and consists primarily of hydrogen, helium, and some heavier atoms and molecules near its base. This region marks the transition between Earth’s atmosphere and the vacuum of outer space. Temperature in the exosphere is highly variable and not representative of heat content due to the low particle density.

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