What percentage of the earth's atmosphere is composed of nitrogen?

The composition of the Earth's atmosphere is primarily dominated by nitrogen, which makes up approximately 78 percent. This significant portion plays a crucial role in various atmospheric processes and serves as a vital component for living organisms as nitrogen is an essential element for proteins and nucleic acids in biological systems. The relatively high percentage of nitrogen in the atmosphere also helps to dilute oxygen and other gases, contributing to the stability and balance of our atmosphere. This understanding of atmospheric composition is critical in fields such as environmental science, meteorology, and ecology. The other percentages listed do not accurately represent atmospheric composition, as oxygen constitutes about 21 percent, while trace gases and other elements make up the remaining portion.