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  2. London dispersion force - Wikipedia

    en.wikipedia.org/wiki/London_dispersion_force

    Interaction energy of an argon dimer.The long-range section is due to London dispersion forces. London dispersion forces (LDF, also known as dispersion forces, London forces, instantaneous dipole–induced dipole forces, fluctuating induced dipole bonds [1] or loosely as van der Waals forces) are a type of intermolecular force acting between atoms and molecules that are normally electrically ...

  3. Dispersion stabilized molecules - Wikipedia

    en.wikipedia.org/wiki/Dispersion_stabilized...

    This distance is well within the combined van der Waals radii of the two H atoms, and at the time was the shortest reported H•••H contact. [7] The bond critical points in (C t Bu) 4 based on AIM analysis. The critical points between H atoms on the t Bu groups is possible evidence for dispersion stabilization.

  4. Electron configurations of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Electron_configurations_of...

    This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. For phosphorus (element 15) as an example, the concise form is [Ne] 3s 2 3p 3.

  5. Helium dimer - Wikipedia

    en.wikipedia.org/wiki/Helium_dimer

    However, the van der Waals force exists between helium atoms as shown by the existence of liquid helium, and at a certain range of distances between atoms the attraction exceeds the repulsion. So a molecule composed of two helium atoms bound by the van der Waals force can exist. [4] The existence of this molecule was proposed as early as 1937. [5]

  6. Intermolecular force - Wikipedia

    en.wikipedia.org/wiki/Intermolecular_force

    Intermolecular forces observed between atoms and molecules can be described phenomenologically as occurring between permanent and instantaneous dipoles, as outlined above. Alternatively, one may seek a fundamental, unifying theory that is able to explain the various types of interactions such as hydrogen bonding , [ 22 ] van der Waals force ...

  7. Helium atom - Wikipedia

    en.wikipedia.org/wiki/Helium_atom

    A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with two neutrons, depending on the isotope, held together by the strong force. Unlike for hydrogen, a closed-form solution to the Schrödinger equation for the helium atom has ...

  8. Interatomic potential - Wikipedia

    en.wikipedia.org/wiki/Interatomic_potential

    A force field is the collection of parameters to describe the physical interactions between atoms or physical units (up to ~10 8) using a given energy expression. The term force field characterizes the collection of parameters for a given interatomic potential (energy function) and is often used within the computational chemistry community. [ 50 ]

  9. Atomic radius - Wikipedia

    en.wikipedia.org/wiki/Atomic_radius

    Under most definitions the radii of isolated neutral atoms range between 30 and 300 pm (trillionths of a meter), or between 0.3 and 3 ångströms. Therefore, the radius of an atom is more than 10,000 times the radius of its nucleus (1–10 fm ), [ 2 ] and less than 1/1000 of the wavelength of visible light (400–700 nm ).