Explain the para magnetism in O2 using MOT(molecular orbital theory).

Oxygen atom has electronic config. 1s2 2s2 2p4 i.e. 8 electrons,  

A molecular orbital is formed due to combination of 2 atomic orbitals thus it can be written as

O2(16e-) =σ1s2σ*1s2σ2s2σ*2s2σ2pz2(π2px2=π2py2)(π*2px1=π*2py1)  

O2 is paramagnetic due to presence of 2 unpaired electrons in π* orbitals. 

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