How many postulates are there in valence bond theory?

The three main postulates of the valence bond theory are: (1)When two valence orbitals of different atoms overlap with each other, a covalent bond forms. In the area between that of the two bonding atoms the electron density due to the overlapping. This makes the resulting molecule stable.

What are the important postulates of valence bond theory of coordination compounds?

Postulates for valence bond theory for coordination compounds are: -metal atoms which are under the influence of ligands, use its s, p, d, and f orbitals for hybridization in forming hybrid orbitals. – the number of vacant orbits available in the central metal atom decides its coordination number.

What are the main postulates of Vespa theory?

Postulates of VSEPR Theory:

• In polyatomic molecules (i.e. molecules made up of three or more atoms), one of the constituent atoms is identified as the central atom to which all other atoms belonging to the molecule are linked.
• The total number of valence shell electron pairs decides the shape of the molecule.

What are the main postulates of molecular orbital theory?

Postulates of MOT:

• Molecular orbital theory asserts that atomic orbitals no longer hold significant meaning after atoms form molecules.
• Atomic orbitals of comparable energy and proper symmetry combine together to form molecular orbitals.

What are the postulates of valence bond theory class 12?

Postulates of Valence Bond Theory The overlapping of two half-filled valence orbitals of two different atoms results in the formation of the covalent bond. The overlapping causes the electron density between two bonded atoms to increase. This gives the property of stability to the molecule.

What are the postulates of molecular orbital theory?

What are the postulates of Vsepr theory write any four?

(a) The shape of the molecule depends upon the number of electron pairs present in the valence shell around the central atom in a molecule. (b) Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.

What are the three postulates of Vsepr theory?

Three postulates of VSEPR Theory are given as below : (i) The shape of the molecule is determined by repulsion between the electron pairs around the central atom. (iii) The electron pairs are oriented around central atom in such a way that repulsion is minimum.

What are the main point of MOT?

The features of MOT are: Two atoms come together, interact and forms a bond. The molecular orbitals are formed by mixing of the atomic orbitals of same energy level and symmetry. After formation of molecular orbital, the atomic orbitals lose their identity.

What is a limitation of MO theory?

MO theory says that the electrons are delocalized. That means that they are spread out over the entire molecule. The main drawback to our discussion of MO theory is that we are limited to talking about diatomic molecules (molecules that have only two atoms bonded together), or the theory gets very complex.

What are the postulates of Werner’s theory?

The important postulates of Werner’s theory are:

• The central metal or the metal atoms in coordination compounds show two types of valency.
• The primary valency relates to the oxidation state and the secondary valency relates to the coordinate number.
• The number of secondary valences is fixed for every metal atom.

What are the limitations of molecular orbital theory?