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Nitrogen, carbon, and oxygen are three of the most common elements in the Earth's atmosphere. Nitrogen makes up approximately 78% of the atmosphere, oxygen makes up about 21%, and carbon is present in smaller quantities as carbon dioxide.

In terms of chemical composition, nitrogen is a diatomic molecule (N2), oxygen is also a diatomic molecule (O2), and carbon is a nonmetal that forms compounds with a wide variety of other elements. When these elements combine, they can form a variety of compounds with nitrogen, carbon, and oxygen present in proportion to each other.

One of the most well-known compounds with nitrogen, carbon, and oxygen as its main components is nitric acid (HNO3), which contains nitrogen, hydrogen, carbon, and oxygen. Another compound that features these elements is nitrogen dioxide (NO2), a brownish gas that has a strong odor.

Nitrogen-containing compounds with oxygen and carbon, such as urea (CO(NH2)2) and creatine (C4H9N3O2), also exist and play important roles in various biological processes. While the specific properties and uses of these compounds can vary widely, studying the basic chemistry of nitrogen, carbon, and oxygen and how they combine is fundamental to understanding a wide range of phenomena in fields such as medicine, chemistry, and physics.

The chemical reactions and processes involving these elements are crucial for various industrial and environmental applications. Furthermore, the study of these elements provides insights into their role in the Earth's atmosphere, earth's biogeochemical processes, and living organisms' vital functions.