What do atoms combine to form?

Atoms combine to form molecules through chemical bonds, which occur when atoms share or transfer electrons. This process allows for the formation of various types of molecules that can have distinct properties and functions. Molecules can range from simple ones, such as water (H₂O) or carbon dioxide (CO₂), to complex organic compounds that play essential roles in biological systems.

In biological contexts, molecules such as proteins, carbohydrates, lipids, and nucleic acids are critical for cellular structures and functions. These molecules ultimately participate in more complex structures and systems in living organisms, such as cells, tissues, and organs, but the foundational step involves the combination of atoms to create molecules.