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Molecular Orbital Theory - Coggle Diagram
Molecular Orbital Theory
When the atomic orbital overlap, they form a new orbital. This new orbital is called molecular orbital.
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When two atomic orbitals combine, they form two new orbitals called Bonding molecular orbital and Anti-bonding orbital.
Bonding atomic orbital has low energy and greater stability, and Anti-bonding orbital has high energy and lesser stability.
Bonding orbital is represented by sigma and pi (σ,π) and Anti-bonding orbital is represented by sigma-star and pi-star 
Filling of molecular orbital take place according to the Afbao rule, Hund's Rule, Pauli's Exclusion.
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Bonding electron > Anti- bonding electron= stable; Bonding electron < Anti- bonding electron= unstable; Bonding electron = Anti- bonding electron= unstable
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Hydrogen Bonding:
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When hydrogen atom of one molecule and electronegative atom (Fluorine, oxygen, nitrogen) of other molecule attract towards each other, they form hydrogen bond. Ex: H O, NH
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