What is the most abundant element in the air?

Nitrogen is indeed the most abundant element in the atmosphere, comprising about 78% of the Earth's air by volume. Its predominance is significant for various biological and chemical processes. Nitrogen plays a crucial role in the nitrogen cycle, which is essential for plant growth and the health of ecosystems.

Oxygen, while necessary for most life forms and making up about 21% of the atmosphere, is not as abundant as nitrogen. Carbon dioxide, although important for photosynthesis and as a greenhouse gas, constitutes a very small fraction of the atmosphere—around 0.04%. Argon is present in trace amounts, accounting for roughly 0.93% of the atmosphere. Understanding these proportions helps highlight the importance of nitrogen in sustaining life and various environmental processes.