covalent bond

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Related to Covalent bonds: Covalent Compounds, Polar covalent bonds

covalent bond

(kō'vā`lənt): see chemical bondchemical bond,
mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an
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Covalent Bond


a chemical bond between two atoms that is formed by a shared electron pair (one electron from each atom). Covalent bonds exist both in molecules (in all states of aggregation) and between the atoms that form crystal lattices. They may unite like atoms (in H2 and C12 molecules and diamond crystals) or unlike atoms (in water molecules and crystals of carborundum, SiC).

Almost all the main bonds in the molecules of organic compounds are covalent (C—C, C—H, C—N, and so on). Covalent bonds are very strong, which explains the low chemical activity of paraffin hydrocarbons. Many inorganic compounds whose crystals have an atomic lattice (that is, are formed by a covalent bond) are refractory and characterized by great hardness and wear resistance; among them are certain carbides, suicides, borides, and nitrides (particularly borazone, BN), which are widely used in modern technology.


covalent bond

[kō′vā·lənt ′bänd]
A bond in which each atom of a bound pair contributes one electron to form a pair of electrons. Also known as electron pair bond.
References in periodicals archive ?
1] almost completely disappears, suggesting that the M-POSS structures are chemically incorporated into the hybrid materials and form a cross-linking network structure in covalent bonds.
The important point is that this process in which the covalent bonds give up energy is equivalent to cooling.
The covalent bond between the topcoat and the basecoat is formed by reaction of the functional groups in the hyaluronate molecule with functional groups in the acrylate resin of the basecoat.
Atoms on different layers of MWNTs are not connected by covalent bonds and the only interaction between them is through van der Waals forces.
The strong directional characteristic of covalent bonds is a significant indicator of the magnetic nature of the bond, and the close proximity of the associated electron orbitals is consistent with dominant magnetic interaction.
Covalent bonds occur when atoms share their electrons, which travel back and forth between the two atoms.
These "supramolecular" chemistries allow formation of directional hydrogen bonds that emulate the stronger covalent bonds.
Neither of them had any way of ascertaining the nature of hydrogen bonds, which are ten times weaker than the covalent bonds between oxygen and hydrogen, but which still require a lot of energy to break, resulting in slow melting of ice at above zero temperatures.
Photoaptamers are single-stranded DNA molecules that have the ability to form covalent bonds with their cognate proteins when they are electronically excited.
Paramus, NJ 07652) has developed Activa TG (TG), which crosslinks proteins by forming covalent bonds between two amino acids, glutamine and lysine.
a high-vacuum wafer bonding system , which enables electrically conductive and oxide-free covalent bonds at room temperature .
For example, a disubstituted nanoparticle with two terminal carboxylate groups pointing in opposite directions can form covalent bonds with a symmetrical diamine such as ethylenediamine.