CHEM 1061 1nd Edition Lecture 23 Outline of Last Lecture II Electron Configuration for Cl Br and I III Transition Elements IV Periodic Trends a Atomic Size Radius b Ionization Energy c Electron Affinity Outline of Current Lecture V Transition Elements VI Ionization Energy a Ionization Energy for Boron and Oxygen b Successive Ionization Energy VII Electron Affinity VIII Metallic Behavior Current Lecture Transition Elements Stay about the same size radius doesn t really grow or shrink Place the following in order of A Increasing atomic size of Ca Rb and K Ca K Rb B Decreasing atomic size of Ca O and Se Ca Se O Ionization Energy IE1 important for later Atom g ion g e Delta H IE1 first ionization energy H is positive because reaction is endothermic Energy is required to remove outermost e These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Ex place in order of increasing IE1 Ca Rb K Rb K Ca Why do B and O families fall out of trend Electron configurations Li He 2s1 Be He 2s2 B He 2s22p1 C He 2s22p2 N He 2s22p3 O He 2s22p4 F He 2s22p5 Removing on electron makes it have full or half filled sub shells which are more stable and thus easier to remove B and O trend go down periodic table B and O family easier to remove electron Successive Ionization Energy IE2 IE3 ETC Atom g ion g e IE1 ion g ion2 g e IE2 ion2 g ion3 g e IE3 ETC IE1 IE2 IE3 for increase in ionization energy or delta H Table 8 5 Delta H for Li Be and B IE1 IE2 IE3 IE4 Li 0 52 7 30 11 80 Be 0 90 1 76 14 85 B 0 80 2 46 3 66 25 02 Li 1s 2 2s 1 2s 1 IE1 valence electrons 1s 2 IE2 and IE3 core electrons Big jumps in IE means you are starting to remove core electrons Be 1s 2 2s 2 2s 2 IE1 IE2 valence 1s 2 IE3 IE4 core B 1s 2 2s 2 2p 1 2s 2 2p 1 IE1 IE2 IE3 valence 1S 2 IE4 IE5 core Electron Affinity EA1 opposite from ionization Atom g e ion g Delta H is necagtive generally exothermic with some exceptions The more northeast on the periodic table the easier it is to add eMetallic Behavior Metals low IE1 easier to remove e lower smaller less negative EA1 harder to add e metals like to form cations Nonmetals high IE1 hard to remove e higher larger more negative EA1 easier to add e Metal vs Nonmetal Oxides Metal Oxides CaO s H2O l Ca OH2 aq base The more metallic the element the more basic the oxide Non Metal Oxides CO2 g H2O l H2CO3 aq More acidic
View Full Document
Unlocking...