covalent bond


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Related to covalent bond: nonpolar covalent bond, Noncovalent bond

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.

V. A. KIREEV

covalent bond

[kō′vā·lənt ′bänd]
(chemistry)
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.
Atoms on different layers of MWNTs are not connected by covalent bonds and the only interaction between them is through van der Waals forces.
Thus, both the ionic bond and the covalent bond involve a magnetically bound (anti-parallel spin-aligned) electron pair that is attracted to two positively charged atomic nuclei by Coulomb forces.
Thus the millions of compounds necessary for life will have a skeleton of carbon atoms, each with four, not two, not three, not five, nor six, covalent bonds.
The additional specificity of the second dimension (photo cross-linking) derives from the requirement that the target amino acid must be positioned appropriately both in distance and orientation to yield the covalent bond (13, 19).
Silane coupling agents are known to promote bonding between two incompatible surfaces by forming covalent bonds.
In other examples, the BSM is designed to have a covalent bond that is both tissue-specific and enzyme-labile that releases the different functionalities of the BSM once it is deposited at the target tissue.
Specific covalent bond formation between the drug and target protease was demonstrated through use of mass spectrometry and also x-ray crystallography.
6] is a covalent bond or a hydrocarbylene group, and A is a functional group.
The covalent bond interactions between PMMA chains and titania nanoparticles induced by the coupling agents decreases the flexibility of the nanocomposite materials and their processability.
The CoLining principle combines the impermeability of a PVC liner with the application speed and the permanent covalent bond of rigid cellular polymer.
The ab initio calculations have also produced a significant negative local energy density at the XeAu bond critical point, implying a buildup of electron charge at that point and formation of a genuine XeAu covalent bond.