oxogen: unkown because of unknown life.
elements: everything but pure potassium because that was not made till 1900's because it acts with air
The element "Oxygen".
nitrogen and oxygen
The top three elements in Earth's atmosphere are nitrogen (78%), oxygen (21%), and argon (0.93%). These three elements together make up the vast majority of the gases present in the atmosphere, with nitrogen being the most abundant.
Oxygen makes up about 21% of Earth's lower atmosphere by volume.
The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
The approximate percentage of oxygen in Earth's lower atmosphere is around 21% by volume.
Oxygen is O and nitrogen is N.
The approximate percentage by volume of oxygen in Earth's atmosphere at location 2 is around 21%.
The two most common elements in Earth's atmosphere are nitrogen, making up about 78%, and oxygen, making up about 21%.
These gases are nitrogen, oxygen and argon.
Earths atmosphere is 78% nitrogen,21%oxygen,0.9% argon,and 0.03% carbon dioxide with very small percentages of other elements
the earths atmosphere is 77% nitrogen, 21% oxygen, with traces of argon, carbon dioxide and water.