Nitrogen and oxygen are the two most predominant; nitrogen is about 79% of the air, and oxygen about 20%. The remaining 1% are various "trace" gasses, of which water vapor, carbon dioxide and argon are probably the most significant.
78% Nitrogen,and 21% Oxygen
Atmosphere.
Any gas or group of gases can make a thin atmosphere.
The atmosphere is composed of approximatly 79% Nitrogen - 20% Oxygen - 1% Argon and 'other gasses'
Hydrogen and helium
The gases that make up Uranus' atmosphere is mainly hydrogen, helium, and methane.
Nitrogen and oxygen.
CO2 makes up approximately 0.03% of Earth's atmosphere
The gases that make up Neptune's atmosphere are 80% hydrogen, 19% helium and 1% methane gas.
The three most common gasses in our atmosphere are: nitrogen 78%, oxygen 21%, and argon <1%.
Nitrogen, oxygen, argon (4th carbon dioxide)
The four main gases in Earth's atmosphere are nitrogen (78%), oxygen (21%), argon (0.9%), and carbon dioxide (0.04%). These gases make up the majority of the atmosphere and are essential for supporting life on Earth.