Ionic strength — The ionic strength, I , of a solution is a function of the concentration of all ions present in a solution. I c = egin{matrix}frac{1}{2}end{matrix}sum m B}=1}^{n} c { m B}z { m B}^{2} where c B is the molar concentration of ion B (mol dm 3), z B … Wikipedia
Ionic order — The Ionic order column forms one of the three orders or organizational systems of classical architecture, the other two canonic orders being the Doric and the Corinthian. (There are two lesser orders, the stocky Tuscan order and the rich variant… … Wikipedia
Ionic compound — In chemistry, an ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds. Usually, the positively charged portion consists of metal cations and the negatively charged portion is a halogen or… … Wikipedia
theory — A reasoned explanation of known facts or phenomena that serves as a basis of investigation by which to seek the truth. SEE ALSO: hypothesis, postulate. [G. theoria, a beholding, speculation, t., fr. theoros, a beholder] adsorption t. of narcosis… … Medical dictionary
Debye–Hückel theory — The Debye–Hückel theory was proposed by Peter Debye and Erich Hückel as a theoretical explanation for departures from ideality in solutions of electrolytes.[1] It was based on an extremely simplified model of the electrolyte solution but… … Wikipedia
DLVO theory — The DLVO theory is named after Derjaguin and Landau, Verwey and Overbeek. The theory describes the force between charged surfaces interacting through a liquid medium. It combines the effects of the van der Waals attraction and the electrostatic… … Wikipedia
HSAB theory — The HSAB concept is an acronym for hard and soft (Lewis) acids and bases. Also known as the Pearson acid base concept, HSAB is widely used in chemistry for explaining stability of compounds, reaction mechanisms and pathways. It assigns the terms… … Wikipedia
Modern valence bond theory — is the term used to describe applications of valence bond theory with computer programs that are competitive in accuracy and economy with programs for the Hartree Fock method and other molecular orbital based methods. The latter methods dominated … Wikipedia
VSEPR theory — Valence shell electron pair repulsion (VSEPR) theory is a model in chemistry used to predict the shape of individual molecules based upon the extent of electron pair electrostatic repulsion.[1] It is also named Gillespie–Nyholm theory after its… … Wikipedia
Density functional theory — Electronic structure methods Tight binding Nearly free electron model Hartree–Fock method Modern valence bond Generalized valence bond Møller–Plesset perturbation theory … Wikipedia
