自秋镜试对 Theories 视中院 Valence Bond Theory价键理论 oconcerns itself with the formation of sigma and pi bonds. VSEPR:Valence Shell Electron Pair Repulsion Theory The premise of VSEPR is that the valence electron pairs surrounding an atom mutually repel each other,and will therefore adopt an arrangement that minimizes this repulsion,thus determining the molecular geometry. VSEPR addresses molecular shape through orbitals that are energetically accessible for bonding
Theories ◼Valence Bond Theory价键理论 ⚫concerns itself with the formation of sigma and pi bonds. ◼VSEPR: Valence Shell Electron Pair Repulsion Theory ⚫The premise of VSEPR is that the valence electron pairs surrounding an atom mutually repel each other, and will therefore adopt an arrangement that minimizes this repulsion, thus determining the molecular geometry. ⚫VSEPR addresses molecular shape through orbitals that are energetically accessible for bonding
0标4花对 Theories Molecular Orbital Theory o model for understanding how atoms and electrons are assembled into molecules and polyatomic ions. ■Hybridization Theory:杂化轨道理论 ● a covalent bond is formed by the overlap of two singly occupied hybrid or atomic orbitals. ● Hybrid atomic orbitals are created by mixing together atomic orbitals to form an equal number of new hybrid atomic orbitals
Theories ◼Molecular Orbital Theory ⚫ model for understanding how atoms and electrons are assembled into molecules and polyatomic ions. ◼Hybridization Theory杂化轨道理论 ⚫ a covalent bond is formed by the overlap of two singly occupied hybrid or atomic orbitals. ⚫ Hybrid atomic orbitals are created by mixing together atomic orbitals to form an equal number of new hybrid atomic orbitals
自秋不转大对 sp Hybrid Orbitals 2 VSEPR pairs,destructive constructive Linear electron overlap overlap pair geometry, 180°bond angle sp hybrid constructive destructive overlap overlap second sp hybrid
sp Hybrid Orbitals 2 VSEPR pairs， Linear electron pair geometry， 180°bond angle
自秋不特大对 sp2 Hybrid Orbitals 院 ■ 3 VSEPR pairs,Trigonal planar e-pair geometry,120 bond angle sp-hybrid orbitals unhybridized P.orbital 120 120° three sp2hybrid orbitals superimposed sp-hybrid carbon atom (viewed from the side) Copyright 2005 Pearson Prentice Hall,Inc
sp2 Hybrid Orbitals ◼3 VSEPR pairs, Trigonal planar e- pair geometry, 120° bond angle
1209 Sp2 sp2 sp2 side view top view AdGif-UNREGISTERED To form a planer carbon
To form a planer carbon