Chapter 5 Stucture of polyatomic molecules (A) 5.1 Theory of hybrid orbital and atomic orbital hybridization 1.Theory of hybrid orbital Two Theories of Bonding MOLECULAR ORBITAL THEORY valence electrons are delocalized valence electrons spread over entire molecule. VALENCE BOND THEORY 。 valence electrons are localized between atoms (or are lone pairs). half-filled atomic orbitals overlap to form bonds.Chapter 5 Stucture of polyatomic molecules (A) MOLECULAR ORBITAL THEORY MOLECULAR ORBITAL THEORY • valence electrons are valence electrons are delocalized delocalized • valence electrons spread over entire molecule. valence electrons spread over entire molecule. Two Theories of Bonding Two Theories of Bonding VALENCE BOND THEORY VALENCE BOND THEORY • valence electrons are valence electrons are localized localized between atoms (or are between atoms (or are lone pairs). lone pairs). • half-filled atomic filled atomic orbitals orbitals overlap to form bonds. overlap to form bonds. §5.1 Theory of hybrid orbital and atomic orbital hybridization 1. Theory of hybrid orbital