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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. Electron configuration - Wikipedia

    en.wikipedia.org/wiki/Electron_configuration

    The approximate order of filling of atomic orbitals, following the arrows from 1s to 7p. (After 7p the order includes subshells outside the range of the diagram, starting with 8s.) The principle works very well (for the ground states of the atoms) for the known 118 elements, although it is sometimes slightly wrong. The modern form of the aufbau ...

  4. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    This is an accepted version of this page This is the latest accepted revision, reviewed on 22 January 2025. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...

  5. 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 ...

  6. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    The direction of the red arrow indicates the order of state filling. Although it is sometimes stated that all the electrons in a shell have the same energy, this is an approximation. However, the electrons in one subshell do have exactly the same level of energy, with later subshells having more energy per electron than earlier ones. This ...

  7. EnergyGuide - Wikipedia

    en.wikipedia.org/wiki/EnergyGuide

    [4] The first appliance labeling rule was established in 1979 and all products were required to carry the label starting in 1980. Energy Star is a similar labeling program, but requires more stringent efficiency standards for an appliance to become qualified, and is not a required program, but rather a voluntary one.

  8. Private label - Wikipedia

    en.wikipedia.org/wiki/Private_label

    Two brands of aspirin.Left: a national brand made by Bayer.Right: a private-label brand. Note the price difference and similar boxes. A private label, also called a private brand or private-label brand, is a brand owned by a company, offered by that company alongside and competing with brands from other businesses.

  9. Template : Extended periodic table (by Aufbau, 50 columns ...

    en.wikipedia.org/wiki/Template:Extended_periodic...

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