Lewis theory Electron pair theory(电子配对理论)一forming bond by sharing a pair of electrons共用电子对成键。 ·the Octet rule(八隅体规则) ●Lewis structure CI: 0=c=0 H一H :c-c-d: NEN: :CI: Exceptions to the octet rule:BF3,PCls,SF et al B:2S22P1,F:2S22P5一. Lewis theory Electron pair theory(电子配对理论)——forming bond by sharing a pair of electrons 共用电子对成键。 Exceptions to the octet rule: BF3, PCl5, SF6 et al • Lewis structure • the Octet rule (八隅体规则) H—H :Cl ⋅⋅ ⋅⋅ Cl: ⋅⋅ ⋅⋅ :Cl: ⋅⋅ :Cl: ⋅⋅ C :N N: O ⋅⋅ ⋅⋅ C O ⋅⋅ ⋅⋅ B: 2S22P1; F: 2S22P5