Bond Order Calculator
Calculate bond order in molecules using molecular orbital theory, Lewis structures, and resonance forms.
Enter Bond Data
Resonance Forms
Results
Enter bond data to calculate bond order
Bond Order Theory
Molecular Orbital Formula
Bond Order = (Bonding e⁻ - Antibonding e⁻) / 2
- • Higher bond order = stronger bond
- • Bond order 1 = single bond
- • Bond order 2 = double bond
- • Bond order 3 = triple bond
Bond Properties
- • Bond strength increases with order
- • Bond length decreases with order
- • Bond energy increases with order
- • Fractional orders indicate resonance
Common Bond Orders
Single Bonds (1.0)
- • H-H (H₂)
- • C-H (methane)
- • O-H (water)
- • N-H (ammonia)
- • C-C (ethane)
Double Bonds (2.0)
- • O=O (O₂)
- • C=O (carbonyl)
- • C=C (ethylene)
- • S=O (sulfoxide)
- • N=O (nitro)
Triple Bonds (3.0)
- • N≡N (N₂)
- • C≡C (acetylene)
- • C≡N (cyanide)
- • C≡O (carbon monoxide)
Resonance Examples
Benzene (C₆H₆)
- • Two resonance forms
- • Each C-C bond: 1.5 order
- • Delocalized π electrons
- • Aromatic stability
Ozone (O₃)
- • Two resonance forms
- • Each O-O bond: 1.5 order
- • Bent molecular geometry
- • Delocalized electrons