How to calculate bond order?

➥In Lewis description of a covalent bond, the bond order is given by the number of bonds between the two atoms in a molecule.

➥The bond order can be calculated by using the following formula:-

                       B.O. = 1/2 (Nb - Na)

              

                  Nb = number of electrons in 

                            bonding molecular

                            orbital

                  Na = number of electrons in

                           antibonding molecular

                           orbital.

➥Examples:-

➥Trick:-

➠Number of electrons = 1,3,5,7 (odd) ➙ Bond order = 0.5

➠Number of electrons = 2,4,6,8 (even) ➙ Bond order = 0

➠Some important examples of bond order calculation on the basis of above trick are given below:-

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