Answer: The total energy of the bonded atoms decreases. The bonded atoms become more stable.
What happens when atoms bond?

A chemical bond is a lasting attraction between atoms ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bonds" such as cova…

A chemical bond is a lasting attraction between atoms ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bonds" such as covalent ionic and metallic bonds and "weak bonds" or "secondary bonds" such as dipole–dipole interactions the London dispersion force and hydrogen bonding. Since opposite charges attract via a simple electromagnetic force the negatively charged electrons that are orbiting the nucleus and the positively charged protons in the nucleus attract each other. An electron positioned between two nuclei will be attracted to both of them and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond. Due to the matter wave nature of electrons and their smaller mass they must occupy a much larger amount of volume compared with the nuclei and this volume occupied by the electrons keeps the atomic nuclei in a bond relatively far apart as compared with the size of the nuclei themselves. In general strong chemical bonding is associated with the sharing or transfer of electrons between the participating atoms. The atoms in molecules crystals metals and diatomic gases—indeed most of the physical environment around us—are held together by chemical bonds which dictate the structure and the bulk properties of matter. All bonds can be explained by quantum theory but in practice simplification rules allow chemists to predict the strength directionality and polarity of bonds. The octet rule and VSEPR theory are two examples. More sophisticated theories are valence bond theory which includes orbital hybridization and resonance and molecular orbital theory which includes linear combination of atomic orbitals and ligand field theory. Electrostatics are used to describe bond polaritie… Read more on Wikipedia

A chemical bond is an attraction between atoms. This attraction may be seen as the result of different behaviors of the outermost or valence electrons of atoms. These behaviors merge into each other seamlessly in various circumstances so that there is no clear line to be drawn between them. However it remains useful and customary to differentiate between different types of bond which result in d…

A chemical bond is an attraction between atoms. This attraction may be seen as the result of different behaviors of the outermost or valence electrons of atoms. These behaviors merge into each other seamlessly in various circumstances so that there is no clear line to be drawn between them. However it remains useful and customary to differentiate between different types of bond which result in different properties of condensed matter . In the simplest view of a covalent bond one or more electrons (often a pair of electrons) are drawn into the space between the two atomic nuclei. Energy is released by bond formation. This is not as a result of reduction in potential energy because the attraction of the two electrons to t...

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