We explain what a covalent bond is and some of its characteristics. In addition, covalent bond types and examples.
It is called covalent bond to a type of chemical bond , which occurs when two atoms bond to form a molecule, sharing electrons belonging to its most superficial layer, thereby reaching the known “stable octet” (according to the “octet rule ”Proposed by Gilbert Newton Lewis on the electrical stability of atoms). The atoms thus linked share a pair (or more) of electrons , whose orbit varies and is called the molecular orbital.
Covalent bonds are different from ionic bonds , in which an electron transfer occurs and occurs between metallic elements. The latter also form electrically charged molecules, called ions: cations if they have a positive charge, anions if they have a negative charge.
In contrast, certain covalent bonds (between different atoms) are characterized by a concentration of electronegativity in one of the two atoms together, since they do not attract the cloud of electrons around them with the same intensity.
This results in an electric dipole, that is, a molecule with a positive and negative charge at its ends, such as an ordinary battery: a positive pole and a negative pole. Thanks to this, covalent molecules join with similar ones and form more complex structures.
There are the following types of covalent bond, based on the amount of electrons shared by the bonded atoms:
On the other hand, according to the presence or not of polarity, one can distinguish between polar covalent bonds (which form polar molecules) and non-polar covalent bonds (which form non-polar molecules):
Simple examples of covalent bonding are those given in the following molecules:
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