Defination : The bond order is the number of bonding pairs of electrons in a bond.
For example : in C:C the bond order is = 1 ( sigle bond , so one pair one electron)
in C::C the bond order is =2 ( double bond , so two pair of electrons)
More explanation : So, when you have to determine the bond order between two covalently bonded atoms, you need to follow these two simple steps:
1) Draw the lewis structure.
For example : CN- that is cyanide
2) Figure out the type of bond between the two atoms
Since there are 3 dashes , that means there is a triple bond between C and N of cyanide.A triple bond means that there is a bond order of three.
Example:Determine the bond order for H2
Step 1 : Draw the lewis structure
H2 : H - H
Step 2 : Find the type of bond between the two atoms
as there is a single bond between the H atoms ie only 1 dash, this means bond order is 1.