Chapter Two Oxygen Family ( GroupⅥ) Central Contents 1. Know the general properties of group VI 2. Understand the structure of ozone and formation of i bond 3. Understand the structure and properties of H2O 4. Know well the properties of H2S, MSy 5. Understand the properties of the oxyacids of sulfur(H2S04, H2S2O3, H2S2O7, H2S2O8)and their 6. Know how to identify $, SO3, S203 and SO4 Section One General Properties Sulfur Selenium tellurium Polonium Element (O) (Te) (Po) Atomic number 8 16 34 52 84 Valence shell electron 32p4|3 configuration Atomic radius/pm 66 117 137 153 0,-2,0,+2 -2,0,+2 Oxidation number 1-2.0 +4+6 M6+ 221 lonic radius/pm M 56 67 First ionization energy 1314 1000 869 812 I,/kJ-mol- Electronic affinity 200.4 -190.2 -173.7 EAJkJ mor Electronegativity 3.5 2.5 2.4 2.0 第12页 2006-02-22第 12 页 2006-02-22 12 Chapter Two Oxygen Family (Group Ⅵ) Central Contents: 1. Know the general properties of group Ⅵ 2. Understand the structure of ozone and formation of π bond 3. Understand the structure and properties of H2O2 4. Know well the properties of H2S, MxSy 5. Understand the properties of the oxyacids of sulfur (H2SO4, H2S2O3, H2S2O7, H2S2O8) and their salts 6. Know how to identify S2-, SO3 2-, S2O3 2- and SO4 2- Section One General Properties Element Oxygen (O) Sulfur (S) Selenium (Se) Tellurium (Te) Polonium (Po) Atomic number 8 16 34 52 84 Valence shell electron configuration 2s2 2p4 3s2 3p4 4s2 4p4 5s2 5p4 6s2 6p4 Atomic radius/pm 66 104 117 137 153 Oxidation number -1,-2,0 -2,0, +4,+6 -2,0,+2, +4,+6 -2,0,+2, +4,+6 - M6+ 140 184 198 221 - Ionic radius/pm M2- - 29 42 56 67 First ionization energy I1/kJ·mol-1 1314 1000 941 869 812 Electronic affinity EA1/kJ·mol-1 -141 -200.4 -195 -190.2 -173.7 Electronegativity 3.5 2.5 2.4 2.1 2.0