# What is meant by

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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