Answer :

Bond order is defined as one half of the difference between the number of electrons present in the bonding and anti-bonding orbitals of a molecule.

If Na is equal to the number of electrons in an anti-bonding orbital, then Nb is equal to the number of electrons in a bonding orbital.


Bond Order:



If Nb > Na, then the molecule is said be stable. However, if Nb≤ Na, then the molecule is considered to be unstable.


Bond order of N2 :



Number of bonding electrons, Nb = 10


Number of anti-bonding electrons, Na = 4


Bond order of nitrogen molecule= 1/2 (10-4)=3


Bond order of O2:



Number of bonding electrons, Nb = 8


Number of anti-bonding electrons, Na = 4.


Bond order of Oxygen molecule = 1/2 (8-4)=2


Bond order of O2+ :



Number of bonding electrons, Nb = 8


Number of anti-bonding electrons, Na = 3


Bond order of O2- = 1/2 (8-3) = 2.5


Bond order of O2-:



Number of bonding electrons, Nb = 8


Number of anti-bonding electrons, Na = 5


Bond order of O2- = 1/2 (8-5) = 1.5


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