negatively charged center
61SN2 reaction — The SN2 reaction (also known as bimolecular nucleophilic substitution) is a type of nucleophilic substitution, where a lone pair from a nucleophile attacks an electron deficient electrophilic center and bonds to it, expelling another group called …
62Quasiparticle — In physics, quasiparticles (and related collective excitations) are emergent phenomena that occur when a microscopically complicated system such as a solid behaves as if it contained different (fictitious) weakly interacting particles in free… …
63Atomic theory — Atomic model redirects here. For the unrelated term in mathematical logic, see Atomic model (mathematical logic). This article is about the historical models of the atom. For a history of the study of how atoms combine to form molecules, see… …
64Bohr model — In atomic physics, the Bohr model created by Niels Bohr depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus mdash;similar in structure to the solar system, but with… …
65tau — /tow, taw/ for 1, 2, 4; /tahv, tawv/ for 3, n. 1. the 19th letter of the Greek alphabet (T). 2. the consonant sound represented by this letter. 3. tav. 4. Also, tauon. Physics. See tau lepton. [1250 1300; ME < L < Gk taû < Sem; cf. TAV] * * * …
66Albert Einstein — Einstein redirects here. For other uses, see Einstein (disambiguation) …
67Metalloprotein — The structure of hemoglobin. The heme cofactor, containing iron, shown in green. Metalloprotein is a generic term for a protein that contains a metal ion cofactor.[1] Metalloproteins have many different functions in cells …
68VSEPR 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… …
69Dendrimer — Figure 1: Dendrimer and dendron Dendrimers are repetitively branched molecules. [1] [2] The name comes from the Greek word δένδρον (pronounced dendron), which translates to tree . Synonymous terms for dendrimer include arborols and casca …
70Migratory insertion — A migratory insertion is a type of reaction in organometallic chemistry wherein two ligands on a metal complex combine. It is a subset of reactions that very closely resembles the insertion reactions, and both are differentiated by the mechanism… …
