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  2. Aufbau principle - Wikipedia

    en.wikipedia.org/wiki/Aufbau_principle

    In atomic physics and quantum chemistry, the Aufbau principle (/ ˈ aʊ f b aʊ /, from German: Aufbauprinzip, lit. 'building-up principle'), also called the Aufbau rule, states that in the ground state of an atom or ion, electrons first fill subshells of the lowest available energy, then fill subshells of higher energy. For example, the 1s ...

  3. Molecular orbital diagram - Wikipedia

    en.wikipedia.org/wiki/Molecular_orbital_diagram

    The σ from the 2p is more non-bonding due to mixing, and same with the 2s σ. This also causes a large jump in energy in the 2p σ* orbital. The bond order of diatomic nitrogen is three, and it is a diamagnetic molecule. [12] The bond order for dinitrogen (1σ g 2 1σ u 2 2σ g 2 2σ u 2 1π u 4 3σ g 2) is three because two electrons are now ...

  4. List of eponymous laws - Wikipedia

    en.wikipedia.org/wiki/List_of_eponymous_laws

    Andy and Bill's law describes how, when a computer chip is released, new software will be released to use up all of its power. Named for Andy Grove, then CEO of Intel, and Bill Gates, then CEO of Microsoft. Archie's law, in petrophysics, relates the in-situ electrical conductivity of sedimentary rock to its porosity and brine saturation. Named ...

  5. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The energy associated to an electron is that of its orbital. The energy of a configuration is often approximated as the sum of the energy of each electron, neglecting the electron-electron interactions. The configuration that corresponds to the lowest electronic energy is called the ground state. Any other configuration is an excited state.

  6. Open Access Same-Time Information System - Wikipedia

    en.wikipedia.org/wiki/Open_Access_Same-Time...

    To protect and promote generation competition and also enforce fair treatment of external users of the transmission system, FERC issued Order 888 and Order 889 on April 24, 1996. The EPAct of 1992 was the beginning of electric deregulation in North America, but Orders 888 and 889 marked the point where the trading of electricity gained a firm ...

  7. Aufbau - Wikipedia

    en.wikipedia.org/wiki/Aufbau

    Aufbau (German: [ˈaʊ̯fˌbaʊ̯] ⓘ) is a term which was used in publications from 1919 to 1947 in the German language. The term can be translated as "structure", "construction" or as "rebuilding", "reconstruction". [ 1 ]

  8. Sodium-cooled fast reactor - Wikipedia

    en.wikipedia.org/wiki/Sodium-cooled_fast_reactor

    Pool type sodium-cooled fast reactor (SFR) A sodium-cooled fast reactor is a fast neutron reactor cooled by liquid sodium.. The initials SFR in particular refer to two Generation IV reactor proposals, one based on existing liquid metal cooled reactor (LMFR) technology using mixed oxide fuel (MOX), and one based on the metal-fueled integral fast reactor.

  9. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    In order to bookkeep the electrons, Pyykkö places some elements out of order: thus 139 and 140 are placed in groups 13 and 14 to reflect that the 8p 1/2 shell needs to fill, and he distinguishes separate 5g, 8p 1/2, and 6f series. [13] Fricke et al. and Nefedov et al. do not attempt to break up these series. [17] [18]