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Orbitals and electron pairing in valence-bond theory

4 Orbitals and electron pairing in valence-bond theory [Pg.180]

The first electronic function to be defined in direct association with a formal chemical bond was, as expected, for the H2 molecule. It marked the beginning of the so called valence-bond theory, in 1927, and was suggested by the Austrian physicist Walter H. Heitler (1904—1981) and by the German physicist Fritz W. London (1900-1964). [Pg.180]

Firstly, it is recognized that, for two separate H atoms, A and B, with electrons 1 and 2, respectively, the electronic (wave) function can be expressed as the product of the respective Is orbital functions [Pg.180]

it is assumed that, when the atoms are associated to form H2, this fvmction would not need appreciable modification except for the possibility of assigning electron 1 to orbital ls(B) and electron 2 to orbital ls(A)  [Pg.180]

This possibility arises because the electrons in the molecule are indistinguishable. [Pg.181]




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