orbital effect
21Gauche effect — Main article: alkane stereochemistry The term gauche refers to conformational isomers (conformers) where two vicinal groups are separated by a 60° torsion angle. IUPAC defines groups as gauche if they have a synclinal alignment of groups attached …
22Oberth effect — In astronautics, the Oberth effect is where the use of a rocket engine when travelling at high speed generates much more useful energy than one at low speed. Oberth effect occurs because the propellant has more usable energy (due to its kinetic… …
23Zeeman effect — The Zeeman effect (  /ˈzeɪm …
24Electronic effect — An electronic effect influences the structure, reactivity, or properties of molecule but is neither a traditional bond nor a steric effect. [G. L. Miessler and D. A. Tarr “Inorganic Chemistry” 3rd Ed, Pearson/Prentice Hall publisher, ISBN 0 13… …
25Poynting-Robertson effect — The Poynting Robertson effect, also known as Poynting Robertson drag, named after John Henry Poynting and Howard Percy Robertson, is a process by which solar radiation causes a dust grain in the solar system to slowly spiral inward. The drag is… …
26Atomic orbital model — The Atomic Orbital Model is the currently accepted model of the electrons in an atom. It is sometimes called the Wave Mechanics Model. In the atomic orbital model, the atom consists of a nucleus surrounded by orbiting electrons. These electrons… …
27Nephelauxetic effect — The nephelauxetic effect is a term used in the physical chemistry of transition metals. It refers to a decrease in the Racah interelectronic repulsion parameter, given the symbol B, that occurs when a transition metal free ion forms a complex… …
28Inert pair effect — The term inert pair effect is often used in relation to the increasing stability of oxidation states that are 2 less than the group valency for the heavier elements of groups 13, 14, 15 and 16. The term inert pair was first proposed by Sidgwick… …
29Beta-silicon effect — The beta silicon effect also called silicon hyperconjugation in organosilicon chemistry is a special type of hyperconjugation and describes the stabilizing effect of a silicon atom placed in a position once removed (β) from a carbocation. A… …
30Races of the Mass Effect universe — This article is about the fictional races found within the Mass Effect universe. These races are explored in the novels Mass Effect: Revelation and Mass Effect: Ascension, and the video games Mass Effect, Mass Effect Galaxy, and Mass Effect 2.… …
