13.1 Outline on boron family Boron family (IA):B,Al,Ga,In,TI Valence electron configuration:ns2npl Electron deficient elements:number of valence electrons number of valence orbits Electron deficient compounds:number of electron pairs in bonding molecular orbits number of valence orbits(即：还有空的成键轨道) Example:BF3(sp3),H3BO3.B:2S22pl HBF is not electron deficient compound 13.1 Outline on boron family Boron family (ⅢA)：B，Al，Ga，In，Tl Valence electron configuration：ns 2np 1 Electron deficient elements: number of valence electrons < number of valence orbits Electron deficient compounds: number of electron pairs in bonding molecular orbits < number of valence orbits(即：还有空的成键轨道). Example：BF3 (sp3 ), H3BO3。 B: 2S22p1 HBF4 is not electron deficient compound