semiempirical equation

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• Semiempirical constants — ▪ Table Semiempirical constants*      a b      98 californium (Cf) 152.86 −52.9506 96 curium (Cm) 152.44 −53.6825 94 plutonium (Pu) 146.23 −52.0899 92 uranium (U) 147.49 −53.6565 90 thorium (Th) 144.19 −53.2644 88 radium (Ra) 139.17 −52.1476 86… …   Universalium

• radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …   Universalium

• chemical bonding — ▪ chemistry Introduction       any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …   Universalium

• 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

• Timeline of microphysics — Timeline of quantum mechanics, molecular physics, atomic physics, nuclear physics, and particle physics* 585 BC Buddha stated that there were indivisible particles of mind and matter which vibrated 3 trillion times in the blink of an eye which he …   Wikipedia

• Ab initio quantum chemistry methods — are computational chemistry methods based on quantum chemistry.[1] The term ab initio was first used in quantum chemistry by Robert Parr and coworkers, including David Craig in a semiempirical study on the excited states of benzene.[2][3] The… …   Wikipedia

• Nuclear binding energy — is the energy required to split a nucleus of an atom into its component parts. The component parts are neutrons and protons, which are collectively called nucleons. If the binding energy for the products is higher when light nuclei fuse, or when… …   Wikipedia

• Glass electrode — A glass electrode is a type of ion selective electrode made of a doped glass membrane that is sensitive to a specific ion. It is an important part of the instrumentation for chemical analysis and physico chemical studies. In modern practice,… …   Wikipedia

• Topic outline of chemistry — For a more comprehensive list, see the List of chemistry topics. Chemistry is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms, such as molecules, crystals, and metals. Chemistry deals with the… …   Wikipedia

• Globular cluster — s from the Sun and contains hundreds of thousands of stars. [cite news coauthors =The Hubble Heritage team url = http://hubblesite.org/newscenter/newsdesk/archive/releases/1999/26/ title = Hubble Images a Swarm of Ancient Stars work = HubbleSite… …   Wikipedia

• Theoretical chemistry — involves the use of physics to explain or predict chemical phenomena. In recent years, it has consisted primarily of quantum chemistry, i.e., the application of quantum mechanics to problems in chemistry. Theoretical chemistry may be broadly… …   Wikipedia