Covalency and Molecular Structure

An understanding of chemical reactivity begins with the understanding of chemical bonds, that is the style that makes a set of certain atoms (better known as molecule) that is more stable than others. Under these conditions, reaction or chemical bonding changes can be approached and used the theory of organic chemistry rational and consistent. There are two main references can be cited to understand chemical bond. First is the introduction of covalent bonds by electron pair Lewis and Langmuir in 1919. According to this concept, the valence electrons paired together so that the configuration is loaded and elektronelektron skin was seen located mainly in the space between the cores. For elements The second period is almost entirely a constituent of organic compounds, these elements be octet (2s2, 2p6), and for hydrogen is 1s2. The second is understanding of quantum mechanics is made by entering into a chemical followed by a description of the bonding molecular orbitals in molecular hydrogen by Heitler and London. This approach replaces the concept of localized electrons and pave the way to a quantitative understanding of bond; include energy calculations, the optimum bond length, and geometry.