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.
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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.
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Exposing the protein/aptamer complex to ultraviolet light induces covalent bond formation between the photoaptamer and cognate protein.
The formation of Si-O-Ti bond indicates the covalent bond interactions between titania and silica moieties.
g]), and thermal stability because of the existence of the covalent bond between the ABS chains and the silica network, which increased the compatibility between the organic and inorganic phases.
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Relevant to research in such fields as cluster synthesis, main-group derivatives in unusual oxidation states, organometallic polymers, and unstable organometallic compounds and intermediates in matrices, organometallic chemistry is based on reactions and use of a class of compounds that contain a covalent bond between carbon and metal.
During this process, if one atom needs to have extra electrons while others want to have less, these atoms need to have more e in order to fill their outer-most shell, a competition for e occurs, and the result is a covalent bond between the two atoms.
In the presence of F, the covalent bond is cleaved and the activity of the enzyme restored.
When a covalent bond snaps, the sugar molecule goes slack, and the tip bounces back.