What is the Major Constituent of Atmosphere by Percent?

What is the Major Constituent of Atmosphere by Percent?

Answer: Nitrogen

Explanation: Nitrogen, the most abundant gas in Earth’s atmosphere, is a major constituent by percentage. It makes up 79.1% of the gases in Earth’s atmosphere by volume and 78% of that by weight. The next most abundant gas is oxygen, which makes up 20%. There are several other elements and compounds present in significant amounts too, like argon (9%), carbon dioxide (0.035%), hydrogen sulphide (0.00012%), helium (0.00007%), and carbon monoxide (0.00003%).