What is the relationship between atomic structure and molecular orbital theory?

[akashpandey]

Plzz explain me molecular orbital& relation beetween atomic

 

[AdityaDev]

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"

 

[akashpandey]

But i don't understand antibondig orbital.

 

[AdityaDev]

For simplicity, take s orbitals.
when two s orbitals A and B overlap, you have two cases. Either their 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 their nuclei. This is called anti-bonding.
$$\psi_u=N(\psi_A-\psi_B) $$

 

[akashpandey]

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

 

[AdityaDev]

I am in 12th standard and I got this information by reading books. I am preparing for IIT, so I have to learn these concepts. In this forums, people like greg and others might have PhDs and are very experienced. You ask them their secret. I still have a long way to go.

 

[AdityaDev]

Before going to advanced theories, you have to learn about waves and thermodynamics. You should also be comfartable with basic mechanics like conservation of momentum and energy, torque, angular momentum and this happens only after you complete 12th grade. Thats why we learn advanced theories after 12th. So don't confuse yourselves with quantum mechanics now. You can however go through some articles in PF but get advice from senior members.