Why Atoms Are Not Chemically Stable Bond

Ordinarily, atoms are not chemically stable. They tend to combine with themselves and / or with other atoms to form what are generally called molecules. The forces that hold the atoms together in a molecule are collectively described by the word bond. The heart of chemistry is to know how atoms are held together in fixed positions in a molecule in certain definite proportions, attributing definite structure/shape (stereochemistry) and properties (reactivity) for the molecule. We shall see that a stable bond is a quantum mechanical effect and that the electron configurations of the atoms generally change during the formation of bonds. An understanding of the molecular structure enables us to understand the diversity in the physicochemical properties