having various oxidation numbers Outer electron configurations:ns2np1~5 Example:The oxidation numbers of chlorine are+1,+3,+5,+7,-1,0。 Inert electron pair effect(惰性电子对效应)： The compounds of ELEMENTS of low oxidation number are more stable than those of high oxidation number when descending in the same groups 同族元素从上到下，低氧化值化合物比高氧化值化合物变得更稳定
Outer electron configurations ： n s 2 n p1 ~ 5 Example ：The oxidation numbers of chlorine are +1 ，+3 ，+5 ，+7 ，-1 ， 0 。 Inert electron pair effect (惰性电子对效应 ) ： having various oxidation numbers The compounds of ELEMENTS of low oxidation number are more stable than those of high oxidation number when descending in the same groups 同族元素从上到下，低氧化值化合物比高氧化值化合物变得更稳定
Example: Si(II)<SiIV) electron configurations are [Ne]3s2 for Si(II)and Ne]for Si(IV),respectively. Pb(II)>Pb(IV) electron configurations are [Xe]6s2 (inert electron pair effeet )for Pb(II)and [Xe]for Pb(IV),respectively. Large electronegativity,forming covalent compounds
Example： Si(II) <Si(IV) electron configurations are [Ne]3s2 for Si(II) and [Ne] for Si(IV), respectively. Pb(II)>Pb(IV) electron configurations are [Xe]6s2 (Inert electron pair effect )for Pb(II) and [Xe] for Pb(IV), respectively. Large electronegativity, forming covalent compounds
13.2 The elements of boron family 13.2.1 Outline on boron family ©13.2.2 The elemental substances of boron family 13.2.3 The compounds of boron -*13.2.4 The compounds of aluminum
§ 13.2 The elements of boron family *13.2.4 The compounds of aluminum 13.2.3 The compounds of boron 13.2.2 The elemental substances of boron family 13.2.1 Outline on boron family
13.2.1 Outline on boron family Boron family (IIA):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)， 雨林木风1 Example::BF3,gBO3。 B:2S22p1 HBF is not electron deficient compound
13.2.1 Outline on boron family Boron family (ⅢA)：B，Al，Ga，In，Tl Valence electron configuration：ns2np1 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，H3BO3。 B: 2S22p1 HBF4 is not electron deficient compound 雨林木风1
幻灯片9 厢林木风1 B:2S22P1,其1个s轨道和2个P轨道与3个F配位后还有一个空的p轨道
幻灯片 9 雨林木风1 B:2S22P1,其1个s轨道和2个P轨道与3个F 配位后还有一个空的p轨道 webuser, 2010-11-25