Covalent bonding is a form of
chemical bonding that is characterized by the sharing of pairs of
electrons between
atoms, or between atoms and other covalent bonds. In short, attraction-to-repulsion stability that forms between atoms when they share electrons is known as covalent bonding. Covalent bonding includes many kinds of interactions, including
σ-bonding,
π-bonding, metal-metal bonding,
agostic interactions, and
three-center two-electron bonds. The term covalent bond dates from 1939. The prefix co- means jointly, associated in action, partnered to a lesser degree, etc.; thus a "co-valent bond", essentially, means that the atoms share "
valence", such as is discussed in
valence bond theory. In the molecule H2, the hydrogen atoms share the two electrons via covalent bonding. Covalency is greatest between atoms of similar
electronegativities. Thus, covalent bonding does not necessarily require the two atoms be of the same elements, only that they be of comparable electronegativity. Because covalent bonding entails sharing of electrons, it is necessarily
delocalized. Furthermore, in contrast to electrostatic interactions ("
ionic bonds") the strength of covalent bond depends on the angular relation between atoms in polyatomic molecules.
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Un legame covalente puro od omopolare o apolare si instaura quando una o più coppie di
elettroni vengono messe in comune fra due
atomi. Ciò avviene per una ragione ben precisa: gli atomi tendono al minor dispendio energetico possibile ottenibile con la stabilità della loro
configurazione elettronica (ad esempio l'
ottetto). Un tipico esempio è fornito dalla combinazione di due atomi di
idrogeno, che porta alla struttura covalente:H· + ·H --> H:H
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