What is Heitler London theory?
In VB theory, derived from the original work by Heitler and London (1927), the formation of a covalent bond between two atoms is possible if the atoms have, in their valence shell, orbitals containing unpaired electrons: the pairing to a singlet coupled state of two electrons with opposite spin yields the formation of …
Which bond theory can easily predict magnetic and ionization properties?
MO theory states that electrons are distributed in sets of molecular orbitals that can extend over the entire molecule. MO theory can predict magnetic and ionization properties in a straightforward manner.
Who proposed valence bond?
Linus Pauling
In the valence bond (VB) theory, proposed in large part by the American scientists Linus Pauling and John C. Slater, bonding is accounted for in terms of hybridized orbitals of the… The basis of VB theory is the Lewis concept of the electron-pair bond.
Who proposed molecular orbital theory?
Molecular orbital theory was developed in the years after valence bond theory had been established (1927), primarily through the efforts of Friedrich Hund, Robert Mulliken, John C. Slater, and John Lennard-Jones. MO theory was originally called the Hund-Mulliken theory.
What does VBT explain?
What is the valence bond theory? It is a theory which describes chemical bonding. VBT states that the overlap of incompletely filled atomic orbitals leads to the formation of a chemical bond between two atoms. The unpaired electrons are shared and a hybrid orbital is formed.
What is meant by VBT theory?
Valence bond (VB) theory assumes that all bonds are localized bonds formed between two atoms by the donation of an electron from each atom. The theory assumes that electrons occupy atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are attracted to the nucleus of another atom.
What is banana bond theory?
A chemical bond is the phenomenon of chemical species like atoms held together by electrostatic or electronic forces. This type of bond involves three atoms but only two electrons. Since the shape of the electron cloud resembles a banana, it is called a banana bond.
Which is not correct about valence bond theory of metals?
It cannot explain the spherical properties of complex compounds. It cannot explain correlation of magnetic behaviour based on geometry of the complex. It accounts for coordinate bond formation due to overlap of vacant hybrid orbitals. …
What are the salient features of molecular orbital theory?
(i) Molecular orbitals are formed by the linear combination of atomic orbitals having nearly the same energies. (ii) Molecular orbitals are associated with the nuclei of the bonded atom in a molecule. (iii) The number of molecular orbitals formed is equal to the number of combining atomic orbitals.
What are limitations of VBT?
Limitations of Valence Bond Theory They are: It fails to explain the tetravalency of carbon. This theory does not discuss the electrons’ energies. The assumptions are about the electrons being localized to specific locations.
What are the salient features of VBT?
(1) Coordination compounds consist of complex ions, in which ligand coordinates with the metal. (2) The ligand coordinates by donating a pair of electrons to the metal. (3) An adequate number of empty orbitals are made available by the metal atom or ion for the formation of coordinate bonds with suitable ligands.
