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Resonance in chemistry is a tool used (of a prevalent matter in organic chemistry) to represent certain types of molecular structures.

Resonance is a key component of theory of bond of valence and emerges when no conventional model using only the simple, double or triple bonds can explain all the properties observed of the molecule.

The dot diagrams of Lewis often cannot represent the true electronic structure of a molecule.

While one can only show the simple covalent bonds, double or triple using these diagrams, one notes that the molecule observed does not match either these structures but rather has properties in certain an intermediary of direction to the latter.

Structures of resonance are then used to bring closer the true electronic structure.

The materials science is an interdisciplinary field implying the properties of the matter and its applications to various scientific sectors and construction.
It includes elements of physics applied and chemistry, as well as the electrical engineering of chemicals, mechanics, civil and.
With the significant attention of media to the nanoscience and the nanotechnology in recent years, the science of materials was propelled to the row with many universities, sometimes in a discussed way.
In science of materials, rather than to the small happiness seeking and discovering materials and exploiting their properties, one aims to the place at including/understanding materials basically so that new materials with the desired properties can be created.
The base of all the science of materials implies to bring back the desired properties and the relative execution of a material in a certain application to the structure of the atoms and phases in this material by the characterization.

A chemical compound is a chemical substance two of the chemically stuck chemical elements component or more different, with a report/ratio fixes determining the composition.

The report/ratio of each element is usually expressed by chemical formula.

For example, water (H2O) is a compound being composed of two hydrogen atoms metallized on an oxygen atom. The atoms in a compound can be dependent by a series of interactions, extending from the covalent bonds to the electrostatic forces in the ionic bonds.

A continuum of polarities in slavery exist between the purely covalent connection (as in H2) and the ionic bonds.

For example H2O is bound by the polar covalent bonds.

The sodium chloride is an example of an ionic compound.

A chemical bond is the physical phenomenon of chemical substances bound by the attraction of the atoms between them by the division, as well as the exchange, of the electrons - or the forces electrostatic.

The organic chemistry is the scientific study of the structure, the properties, the composition, the reactions, and the synthesis of the organic compounds which contain by definition carbon.

Generally a molecule is the smallest particle of a pure chemical substance which always maintains its properties of composition and chemicals.

Generally strong chemical bonds are found in molecules, the crystals or out of full metal and they organize the atoms of ordered structures.

Weak chemical bonds are classically explained to be effects of polarity, or misses it of him, of the strong bonds.

In chemistry and molecular sciences, a molecule is sufficiently stable, electrically neutral entity made up of two atoms or more.

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