Basics of Biology

Basic Chemistry For Biology

What is a chemical bond?

A chemical bond is an attraction between the electrons present in the outermost energy level or shell of a particular atom. This outermost energy level is known as the valence shell. Atoms with an unfilled outer shell are less stable and tend to share, accept, or donate electrons. When this happens, a chemical bond is formed. In living systems, chemical reactions—with help from enzymes—link atoms together to form molecules.


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