Oxygen molecule, O2:
The electronic configuration of oxygen (i.e., Z = 8) in ground state is 1s22s22p4. Each oxygen atom has 8 electrons; therefore, in O2 molecule there are 16 electrons. Thus, the electronic configuration of O2 is as shown below:
Here (σ1s)2 (σ*1s)2 part of the configuration is abbreviate as KK. The molecular orbital energy level diagram of O2 molecule is illustrated in figure below:
Figure: Molecular orbital energy level diagram of O2 molecule
∴ Bond order = (Nb - Na)/ 2= (8-4)/2 = 2.
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