Electronic Configuration of oxygen (O):
The atomic number of oxygen is 8. Its electronic configuration in the ground state is: 1s2,2s2,2p4
molecular orbital energy diagram for o2
The O2 molecule consists of two oxygen atoms, each contributing its atomic orbitals to form molecular orbitals. Here’s the molecular orbital diagram for o2 :

molecular orbital electronic configuration for o2
σ(1s)², σ*(1s)², σ(2s)², σ*(2s)², σ(2pz)2, π(2px)²=π(2py)² , π*(2px)1=π*(2py)1,
O2 molecule are paramagnetic because unpaired electron is found.
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