• Wikimedia Commons v t e Aircraft airplane · airship · air superiority fighter · attack aircraft · Types of bonds 1 (single) By multiplicity 4 (quadruple) 5 (quintuple) 6 (sextuple) Triplet By spin Singlet Exchange-coupled Lewis structure Concepts Hybrid orbital Resonance Valence bond theory Constituent units Covalent bond Lone pair Molecular orbital Concepts LCAO MO diagram Molecular orbital theory Bonding MO