In 1904, Richard Abegg proposed his rule that the difference between the maximum and minimum valencies of an element is often eight.
At this point, valency was still an empirical number based only on chemical properties. However the nature of the atom became clearer with Ernest Rutherford's 1911 discovery that of an atomic nucleus surrounded by electrons, and Niels Bohr's 1913 model of electron orbits.
At this point, valency was still an empirical number based only on chemical properties. However the nature of the atom became clearer with Ernest Rutherford's 1911 discovery that of an atomic nucleus surrounded by electrons, and Niels Bohr's 1913 model of electron orbits.
Both Lewis and Kossel structured their bonding models on that of Abegg's rule (1904). Niels Bohr also proposed a model of the chemical bond in 1913.
In 1916, chemist Gilbert N.
In 1929, the linear combination of atomic orbitals molecular orbital method (LCAO) approximation was introduced by Sir John Lennard-Jones, who also suggested methods to derive electronic structures of molecules of F2 (fluorine) and O2 (oxygen) molecules, from basic quantum principles.
Most quantitative calculations in modern quantum chemistry use either valence bond or molecular orbital theory as a starting point, although a third approach, density functional theory, has become increasingly popular in recent years. In 1933, H.
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