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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The overlaps get quite close at the point where the d-orbitals enter the picture, [50] and the order can shift slightly with atomic number [51] and atomic charge. [52] [h] Starting from the simplest atom, this lets us build up the periodic table one at a time in order of atomic number, by considering the cases of single atoms.

  3. Thomson problem - Wikipedia

    en.wikipedia.org/wiki/Thomson_problem

    Though experimental evidence led to the abandonment of Thomson's plum pudding model as a complete atomic model, irregularities observed in numerical energy solutions of the Thomson problem have been found to correspond with electron shell-filling in naturally occurring atoms throughout the periodic table of elements.

  4. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    A given atom has an atomic mass approximately equal (within 1%) to its mass number times the atomic mass unit (for example the mass of a nitrogen-14 is roughly 14 Da), but this number will not be exactly an integer except (by definition) in the case of carbon-12. [67] The heaviest stable atom is lead-208, [59] with a mass of 207.976 6521 Da. [68]

  5. Category:Quantum chemistry - Wikipedia

    en.wikipedia.org/wiki/Category:Quantum_chemistry

    Download as PDF; Printable version; ... deals with the application of quantum mechanics to questions in chemistry ... Atomic orbital;

  6. Plum pudding model - Wikipedia

    en.wikipedia.org/wiki/Plum_pudding_model

    Thomson's model marks the moment when the development of atomic theory passed from chemists to physicists. While atomic theory was widely accepted by chemists by the end of the 19th century, physicists remained skeptical because the atomic model lacked any properties which concerned their field, such as electric charge, magnetic moment, volume, or absolute mass.

  7. Bohr–Sommerfeld model - Wikipedia

    en.wikipedia.org/wiki/Bohr–Sommerfeld_model

    ([2] page 364) The Sommerfeld extensions of the 1913 solar system Bohr model of the hydrogen atom showing the addition of elliptical orbits to explain spectral fine structure. The Bohr–Sommerfeld model (also known as the Sommerfeld model or Bohr–Sommerfeld theory ) was an extension of the Bohr model to allow elliptical orbits of electrons ...

  8. Resolution (structural biology) - Wikipedia

    en.wikipedia.org/wiki/Resolution_(structural...

    In structural biology, resolution can be broken down into 4 groups: (1) sub-atomic, when information about the electron density is obtained and quantum effects can be studied, (2) atomic, individual atoms are visible and an accurate three-dimensional model can be constructed, (3) helical, secondary structure, such as alpha helices and beta sheets; RNA helices (in ribosomes), (4) domain, no ...

  9. Bohr model - Wikipedia

    en.wikipedia.org/wiki/Bohr_model

    When Bohr began his work on a new atomic theory in the summer of 1912 [8]: 237 the atomic model proposed by J J Thomson, now known as the Plum pudding model, was the best available. [9]: 37 Thomson proposed a model with electrons rotating in coplanar rings within an atomic-sized, positively-charged, spherical volume. Thomson showed that this ...

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