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The number of electron pairs an atom can share with other atoms.

co·va′len·cy n.
co·va′lent adj.
co·va′lent·ly adv.


(kəʊˈveɪlənsɪ) or


1. (Chemistry) the formation and nature of covalent bonds
2. (Chemistry) the number of covalent bonds that a particular atom can make with other atoms in forming a molecule
coˈvalent adj
coˈvalently adv
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.covalency - valence characterized by the sharing of electrons in a chemical compound; the number of pairs of electrons an atom can share
valence, valency - (chemistry) a property of atoms or radicals; their combining power given in terms of the number of hydrogen atoms (or the equivalent)
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References in periodicals archive ?
Principia's proprietary Tailored Covalency platform enables the company to design and develop reversible and irreversible covalent, small molecule inhibitors with potencies and selectivities that have the potential to rival those of injectable biologics yet maintain the convenience of a pill.
Molecular orbital coefficients in-plane u-bonding ([[alpha].sup.2]), in-plane [pi]-bonding ([[beta].sup.2]), and out-of-plane [pi]-bonding ([[gamma].sup.2]) are the covalency parameters for the metal to ligand bond which were evaluated using the following expressions:
Kauffman, "EPR spectra and covalency of bis(amidinourea/O-alkyl-1-amidinourea)copper(II) complexes part II.
Grabowski, "What is the covalency of hydrogen bonding?," Chemical Reviews, vol.
The degree of oxidation of the iron atom within these molecules determines the covalency and color of iron, that is, ferrous iron ([Fe.sup.+2]) is red, whereas ferric iron ([Fe.sup.+3]) is brown.