# Molecular orbital theory

1. Feb 20, 2015

### akashpandey

Plzz explain me molecular orbital& relation beetween atomic

2. Feb 20, 2015

Have you tried Wikipedia. Do you have NCERT texbook for class 11? They explain it properly. As an introduction,
"In VBt, the atomic orbitals are thought to remain even after bond formation. But in MOT, the valence electrons are considered to be associated with all the nuclei in the molecule. Hence orbitals of different atoms combine to form molecular orbitals"

3. Feb 20, 2015

### akashpandey

But i dont understand antibondig orbital.

4. Feb 20, 2015

For simplicity, take s orbitals.
when two s orbitals A and B overlap, you have two cases. Either thier wave functions have same sign or they have opposite signs.
when they have opposite signs, the waves are out of phase, hence destructive interference takes place and hence there is no electron density at the part where they tried to overlap, that is between thier nuclei. This is called anti-bonding.
$$\psi_u=N(\psi_A-\psi_B)$$

5. Feb 20, 2015

### akashpandey

But how do u know all that things
Plzz say
In this forum how people get a lot of knowledge.
plzz say me how to get advance knowledge in quantum machenics

6. Feb 20, 2015