Bond Order Calculator

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MO theory is most precise for diatomic molecules. Lewis structure mode counts bonds directly. Resonance mode averages the bond order across equivalent positions in a delocalized molecule.
Total electrons occupying bonding molecular orbitals (sigma and pi).
Total electrons occupying antibonding molecular orbitals (sigma* and pi*).
Bond orderDouble bond
2

Number of effective bonds between the atoms

Bond typeDouble bond
Relative strengthShorter and stronger than a single bond (e.g. O=O ~498 kJ/mol).
MO formula result(10 - 6) / 2 = 2.00
2
No bond<0.25Single0.25-1.25Partial1.25-1.75Double1.75-2.25Partial triple2.25-2.75Triple2.75+

Bond order = 2.00: Double bond.

  • A bond order of 2.00 corresponds to a double bond.
  • Higher bond order means a shorter bond length and a higher bond dissociation energy.

Next stepTo go further, look up the experimental bond length and dissociation energy for your molecule and see how they correlate with this bond order.

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