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.

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 ?
t]), which restricts internal rotation around the covalent bonds.
Having achieved surface wetting, adhesion can be further enhanced beyond weak intermolecular attraction by forming covalent bonds between the coating and the substrate.
The acidity of hydroxyl groups result in formation of negatively charged phenoxide ion which is capable of forming ionic and covalent bonds with aminoacids.
As NIR is based on vibrations of covalent bonds, the NIR signal most likely reflects protein content (vibrations in peptide bonds).
No covalent bonds are formed or broken during complex formation, and the organic compounds in complex are in rapid equilibrium with free molecules in the solution.
The double bonds coming from V-POSS or M-POSS had the ability to react with double bonds coming from MMA, so the covalent bonds and cross-linking structure were obtained between POSS and PMMA, which were expected to be beneficial to the outstanding improvement of mechanical and thermal properties of the hybrid materials.
expanded an interlayer space of a layered clay using an organic onium salt, immobilizing a radical polymerization initiator via covalent bonds in the clay.
bonded to two oxygen atoms of hydroxyl group by covalent and two oxygen atoms of the acetyl group by coordinate covalent bonds to form distorted square planner geometry.
A single water molecule consists of a relatively large oxygen atom joined to two smaller hydrogen atoms by standard covalent bonds.
This one had the same covalent bonds that the stem cells could naturally degrade and spread through but also another type of bond that could form when exposed to light.
A DNA molecule is initially composed of a string of nucleoside monophosphates (NMPs) held together by covalent bonds between the 3'--OH of one subunit, and the innermost (alpha) phosphate group on the 5' end of another NMP (the other two phosphate groups are released in the joining reaction).
He begins with the atomic properties of one-electron and two-electron atoms, then explains the atomic properties and periodic trends of atoms with more than two electrons, homonuclear diatomic molecules, gaseous alkali metal haloids with ionic bonds, other heteronuclear diatomic molecules with polar covalent bonds, the Lewis cubical atom model, molecular orbital calculations on heteronuclear diatomic molecules (as well as hybridization and estimation of net atomic charges from calculated electron densities), homonuclear diatomic species of certain second-period elements, structure and bonding (including in simple compounds of the Group 14 elements and those in other Groups), and electron deficient molecules.