Question

How To Calculate Bond Order Of ${{\mathrm{CO}}_3}^{2-}$?

Answer 1

Step 1; Bond order formula:-

• Bond order is defined as the number of chemical bonds formed between a pair of atoms and indicates the stability of a bond.
• The Bond Order Formula is given by;

$\mathrm{Bond}\mathrm{order}(\mathrm{B}.\mathrm{O})=\frac{1}{2}(\mathrm{number}\mathrm{of}\mathrm{bonding}\mathrm{electrons}–\mathrm{number}\mathrm{of}\mathrm{antibonding}\mathrm{electrons})=\frac{1}{2}[\mathrm{Nb}–\mathrm{Na}]$

• Where, ${\mathrm{N}}_{\mathrm{b}}$ = the number of bonding electrons and ${\mathrm{N}}_{\mathrm{a}}$ = the number of antibonding electrons.

Step 2; Calculation of Bond order for ${{\mathrm{CO}}_3}^{2-}$:-

• To Calculate the Bond Order Of CO₃^2-, we can first consider its resonance structure given as;

• Here the total number of bonds in the Carbonate ion${{\mathrm{CO}}_3}^{2-}$ $=4$
• Also the number of bond groups between individual atoms $=3$
• By dividing the bonding groups between the individual atoms by the total number of bonds

$$\begin{gathered} =\frac{4}{3} \\ =1.33 \end{gathered}$$

Therefore, the bond order of the Carbonate ion ${{\mathrm{CO}}_3}^{2-}$ is calculated to be$1.33.$