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Can you give explanation for o2 molecule energy level diagram?

Molecular Orbital (MO) diagram for O₂ molecule.

The electronic configuration of oxygen atom is

The energy level for heavier atoms like oxygen molecule is,

MO diagram of O₂ :

Bond order :

N_b - No. of bonding Orbitals.

N_a - No. of anti bonding Orbitals. (denoted by '*')

? Bond between O₂ molecule is double bond. Also in the anti bonding orbital there are two unpaired electrons (?*2px and ?*2py) and hence it is paramagnetic.