Definition and meaning of covalent bond:

covalent bond - a bond between two or more atoms that is provided by electrons that travel between the atoms' nuclei, holding them together but keeping them a stable distance apart

(Source: US National Oceanic and Atmospheric Administration (NOAA) )

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Covalent bond - History Covalent bond - Bond Polarity Covalent bond - Bond order Covalent bond - Coordinate covalent bonds Covalent bond - Rigidity Covalent bond - Resonance Covalent bond - Current theory

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A special case is called a dative covalent bond, also known as a coordinate covalent bond, which occurs when one atom gives both of the electrons in the bond. ...

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Covalent bond, Covalent bond - History, Covalent bond - Bond Polarity, Covalent bond - Bond order, Covalent bond - Coordinate covalent bonds, Covalent bond - Resonance, Covalent bond - Current theory

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The idea of covalent bonding can be traced to Gilbert N. Lewis, who in 1916 described the sharing of electron pairs between atoms. He introduced the so called Lewis Notation or Electron Dot Notation in which valence electrons (those in the outer shell) are represented as dots around the atomic symbols. Pairs of electrons located between atoms represent covalent bonds. Multiple pairs represent multiple bonds, such as double and triple bonds. Some examples of Electron Dot Notation are shown in the following figure. An alternative form, in which bond-forming electron pairs are repr ...

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Covalent bond, Covalent bond - History, Covalent bond - Bond Polarity, Covalent bond - Bond order, Covalent bond - Coordinate covalent bonds, Covalent bond - Resonance, Covalent bond - Current theory

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Bond order is a term that describes the number of pairs of electrons shared between atoms forming a covalent bond. The most common type of covalent bond is the single bond, the sharing of only one pair of electrons between two individual atoms. All bonds with more than one shared pair are called multiple covalent bonds. The sharing of two pairs is called a double bond and the sharing of three pairs is called a triple bond. An example of a double bond is nitrous acid (between N and O), and an example of a triple bo ...

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Covalent bond, Covalent bond - History, Covalent bond - Bond Polarity, Covalent bond - Bond order, Covalent bond - Coordinate covalent bonds, Covalent bond - Resonance, Covalent bond - Current theory

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There are two types of covalent bonds: Polar covalent bonds, and non-polar (or pure) covalent bonds. The most widely accepted definition of polar covalent is when the atoms involved have an electronegativity difference that is less than 1.67 (though some texts read 1.7), but greater than zero. A pure covalent bond is a bond that occurs when the atoms involved have an electronegativity difference ...

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Covalent bond, Covalent bond - History, Covalent bond - Bond Polarity, Covalent bond - Bond order, Covalent bond - Coordinate covalent bonds, Covalent bond - Resonance, Covalent bond - Current theory

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A coordinate covalent bond (also known as dative covalent bond) is a special type of covalent bond in which the shared electrons come from one of the atoms only. Once the bond has been formed, its strength is no different from that of a covalent bond. Coordinate covalent bonds are formed when a Lewis base (an electron donor or giver) donates a pair of electrons to a Lewis acid (an electron accepter) and the resultant compound is then called an adduct (a compound formed by the addition reaction between two molecules). The ...

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Typically, two atoms can rotate about a single bond with relative ease. However, double and triple bonds are very difficult to rotate because they require p orbital overlap. p orbital overlaps are parallel. ...

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Covalent bond, Covalent bond - History, Covalent bond - Bond Polarity, Covalent bond - Bond order, Covalent bond - Coordinate covalent bonds, Covalent bond - Rigidity, Covalent bond - Resonance, Covalent bond - Current theory

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These chemical bonds are intramolecular forces, that keep atoms held together in molecules and in solids. All these bonds may be single, double or triple, by which it is meant that the amount of electrons participating in a bond (or located in a bonding orbital) is two, four or six, respectively. Quadruple bonds are not unheard of, but they are extremely rare. Chemical bond - Ionic bond. Main articles: Ionic bond, See also:

Chemical bond, Chemical bond - Bonds in chemical formulas, Chemical bond - Strong chemical bonds, Chemical bond - Ionic bond, Chemical bond - Polar covalent bond, Chemical bond - Covalent bond, Chemical bond - Other strong bonds, Chemical bond - Coordinate covalent bond, Chemical bond - Polyatomic ions, Chemical bond - Banana bond, Chemical bond - Chemical bonds involving more than two atoms, Chemical bond - Aromatic bond, Chemical bond - Metallic bond, Chemical bond - Weak chemical bonds, Chemical bond - Dipole-dipole interactions, Chemical bond - Hydrogen bond, Chemical bond - Induced dipole interactions, Chemical bond - Van der Waals forces, Chemical bond - Electrons in chemical bonds, Chemical bond - Limitations of valence bond theory

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This is a sitemap for Oceanography - C . Click on a link and you will find multiple definitions and articles related to the word. The sitemap(s) covers over 5.184 different Oceanography terms.

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The most prominent oxide of carbon is carbon dioxide, CO2. This is a minor component of the Earth's atmosphere, produced and used by living things, and a common volatile elsewhere. In water it forms trace amounts of methanoic acid, HCO2H, but as most compounds with multiple single-bonded oxygens on a single carbon it is unstable. Through this intermediate, though, resonance-stabilized carbonate ions are produced. ...

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Carbon, Carbon - Notable characteristics, Carbon - Applications, Carbon - Other uses, Carbon - History and Etymology, Carbon - Allotropes, Carbon - Occurrence, Carbon - Organic compounds, Carbon - Carbon chains, Carbon - Carbon cycle, Carbon - Isotopes, Carbon - Precautions

Read more here: » Carbon: Encyclopedia II - Carbon - Organic compounds

Many simple compounds involve covalent bonds. These molecules have structures that can be predicted using valence bond theory, and the properties of atoms involved can be understood using concepts such as oxidation number. Other compounds that involve ionic structures can be understood using theories from classical physics. In the case of ionic bonding, electrons are mainly localized on the individual atoms, and electrons do not travel between the atoms very much. Each atom is assigned an overall electric charge to help concept ...

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Chemical bond, Chemical bond - Bonds in chemical formulas, Chemical bond - Strong chemical bonds, Chemical bond - Ionic bond, Chemical bond - Polar covalent bond, Chemical bond - Covalent bond, Chemical bond - Other strong bonds, Chemical bond - Coordinate covalent bond, Chemical bond - Polyatomic ions, Chemical bond - Banana bond, Chemical bond - Chemical bonds involving more than two atoms, Chemical bond - Aromatic bond, Chemical bond - Metallic bond, Chemical bond - Weak chemical bonds, Chemical bond - Dipole-dipole interactions, Chemical bond - Hydrogen bond, Chemical bond - Induced dipole interactions, Chemical bond - Van der Waals forces, Chemical bond - Electrons in chemical bonds, Chemical bond - Limitations of valence bond theory

Read more here: » Chemical bond: Encyclopedia II - Chemical bond - Electrons in chemical bonds

Because of their ubiquitous nature, atoms have been an important field of study for many centuries. Current specific research areas include: the physics of ultra-cold atoms and molecules, including Bose-Einstein condensation, creation of more accurate and precise atomic clocks, collisions involving highly excited states of atoms and molecules including Rydberg states, low-energy elastic and threshold inelastic scattering of charged particles, the search for dark matter, the search for a grand unified quantum theory of gravity, and the study of atoms ...

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Atom, Atom - Properties of the atom, Atom - Subatomic particles, Atom - Atomic forces, Atom - Atom size and speed, Atom - Elements isotopes and ions, Atom - Valence and bonding, Atom - Atomic spectrum, Atom - Atoms and antimatter, Atom - Atoms and the Big Bang, Atom - History of atomic theory, Atom - Philosophical atomism, Atom - Birth of modern atomic theory, Atom - Discovery of subatomic particles, Atom - Study of atomic structure, Atom - Study of atoms

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Most ceramic materials are almost entirely immune to corrosion. The strong ionic and/or covalent bonds that hold them together leave very little free chemical energy in the structure; they can be thought of as already corroded. When corrosion does occur, it is almost always a simple dissolution of the material or chemical reaction, rather than an electrochemical process. A common example of corrosion protection in ceramics is the lime added to soda-lime glass to reduce its solubility in water; though it is not nearly as soluble as pure sodiu ...

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Corrosion, Corrosion - Corrosion in nonmetals, Corrosion - Electrochemical theory, Corrosion - Galvanic series, Corrosion - Resistance to corrosion, Corrosion - Intrinsic chemistry, Corrosion - Passivation, Corrosion - Surface treatments, Corrosion - Cathodic protection, Corrosion - Corrosion in passivated materials, Corrosion - Pitting corrosion, Corrosion - Fretting, Corrosion - Weld decay and knifeline attack, Corrosion - Microbial corrosion, Corrosion - Economic impact

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By common convention, an enzyme's name consists of a description of what it does, with the word ending in -ase. Examples are alcohol dehydrogenase and DNA polymerase. Kinases are enzymes that transfer phosphate groups. This results in different enzymes with the same function having the same basic name; they are therefore distinguished by other characteristics, such as their optimal pH (alkaline phosphatase) or their location (membrane ATPase). Furthermore, the reversibility of chemical reactions means that the normal physiological dir ...

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Enzyme, Enzyme - Etymology and history, Enzyme - 3D-Structure, Enzyme - Specificity, Enzyme - Modifications, Enzyme - Enzyme cofactors, Enzyme - Allosteric modulation, Enzyme - Thermodynamics, Enzyme - Kinetics, Enzyme - Inhibition, Enzyme - Competitive inhibition, Enzyme - Non-competitive inhibition, Enzyme - Partially competitive inhibition, Enzyme - Uncompetitive inhibition, Enzyme - Mixed inhibition, Enzyme - Metabolic pathways and allosteric enzymes, Enzyme - Enzyme naming conventions, Enzyme - Industrial Applications

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The allotropes of carbon are the different molecular configurations (allotropes) that pure carbon can take. The three relatively well-known allotropes of carbon are amorphous carbon, graphite, and diamond. Several exotic allotropes have also been synthesized or discovered, including fullerenes, carbon nanotubes, lonsdaleite and aggregated diamond nanorods. In its amorphous form, carbon is essentially graphite but not held in a crystalline macrostructure. It is, rather, present as a powder which is the main constituent of substances such as charcoal, la ...

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Carbon, Carbon - Notable characteristics, Carbon - Applications, Carbon - Other uses, Carbon - History and Etymology, Carbon - Allotropes, Carbon - Occurrence, Carbon - Organic compounds, Carbon - Carbon chains, Carbon - Carbon cycle, Carbon - Isotopes, Carbon - Precautions

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Collagen has an unusual amino acid composition and sequence. Glycine (Gly) is found at almost every third residue, and collagen contains large amounts of proline, (Pro) — as well as two uncommon derivative amino acids not directly inserted during translation of mRNA: hydroxyproline (Hypro) and hydroxylysine. Prolines and lysines at specific locations relative to glycine are modified post-translationally by different enzymes, both of which require vitamin C as a cofactor. Vitamin C deficiency causes scurvy, a serious and painful disease in ...

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Collagen, Collagen - Composition and structure, Collagen - Human Uses, Collagen - Types of collagen, Collagen - Staining

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Protein - Functions. Proteins are involved in practically every function performed by a cell, including regulation of cellular functions such as signal transduction and metabolism. Life, chemically speaking, is nothing but the function of proteins although the information to make a unique protein resides in DNA. The protein involved in functions control the almost all molecular processes in body. Without such proteins, the activity requires a diffferent set of condition, such as high temperature and pressure. Fun ...

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Protein, Protein - Properties of Protein, Protein - Structure, Protein - Working with proteins, Protein - Protein regulation, Protein - Diversity, Protein - Role of Protein, Protein - Functions, Protein - Within Nutrition, Protein - History

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Quantum mechanics is a fundamental physical theory that replaces Newtonian mechanics and classical electromagnetism at the atomic and subatomic levels and is the underlying framework of many fields of physics and chemistry, including condensed matter physics, quantum chemistry, and particle physics. Along with general relativity, it is one of the pillars of modern physics. Quantum mechanics - Introduction. The term quantum (Latin, "how much") refers to the discrete units that the theory assign ...

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Quantum mechanics - Introduction Quantum mechanics - Description of the theory
Quantum mechanics - Quantum mechanical effects Quantum mechanics - Mathematical formulation Quantum mechanics - Interactions with other scientific theories
Quantum mechanics - Applications of quantum theory Quantum mechanics - Philosophical consequences Quantum mechanics - History
Quantum mechanics - Founding experiments
Quantum mechanics - Notes

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An alkene in organic chemistry is an unsaturated hydrocarbon containing at least one carbon to carbon double bond. The simplest alkenes, with only one double bond, form a homologous series, the alkenes with general formula CnH2n. The simplest alkene is C2H4, which has the common name "ethylene" and the International Union of Pure and Applied Chemistry (IUPAC) name "ethene". Alkenes are also called olefins and vinyl compounds. Alkene - Structure of AlkenesIncluding:

Alkene - Structure of Alkenes
Alkene - Shape of Alkenes Alkene - Molecular Geometry
Alkene - Physical properties Alkene - Chemical properties Alkene - Synthesis Alkene - Reactions
Alkene - Addition reactions Alkene - Oxidation Alkene - Polymerisation
Alkene - Nomenclature of Alkenes
Alkene - IUPAC Names Alkene - Common Names

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