Chem 1211 1st Edition Lecture 19 Outline of Last Lecture I Quantum numbers II Energy of Orbitals Outline of Current Lecture I Electron Configuration Transition II Atomic Properties Atomic Size III Atomic Properties Ionization Energy IV Atomic Properties Ion Size Current Lecture I Electron Configuration Transition a Special stability one e in each of five 3d orbitals and again for two e in each of five 3d orbitals b ConcepTest Which transition metal has the electron configuration Kr 4d55s1 i V ii Cr iii Nb iv Mo v Tc 1 ANSWER Mo 2 REASONING Because of the d5 it has to be under Cr in the periodic table c Ion Cations Reverse i Na Ne 3s1 ii Na Ne d ConcepTest Which transition metal has the electron configuration Ar 4d5 i Mn ii Mn2 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 II III iii Cr iv Cr2 1 ANSWER Mn2 or C e Cations i Electrons removed first from highest n ii Within a shell electrons of maximum removed 1 Na 1s22s22p63s1 Na 1s22s22p6 Ne iii Transition metals ns 4s electrons lost before n 1 3d electrons Atomic Properties Atomic Size a Periodic properties related to valence shell electron configurations i Units pm 10 12 m b ConcepTest Which pair of atoms is NOT listed in order of INCREASING atomic radius i K Rb ii Mg Ca iii O S iv Sr In v Sr Rb 1 ANSWER Sr In 2 REASONING Atomic radius increases as you move from the top to the bottom of the periodic table a Atomic radius decreases as you move left to right across the periodic table c ConcepTest Which pair of atoms would be expected to have the longest interatomic distance in a molecule having such a bond i C C ii C N iii C O iv C S v C Br 1 ANSWER C Br 2 Reasoning Bromium is the largest in the list d ConcepTest Which pair of atoms in a single period would be expected to have the smallest and the largest ionization energies respectively i Li Na ii Li Ne iii Ne Li iv Li Be v F Ne 1 ANSWER Li Ne 2 REASONING Ionization energy atom g atom g eAtomic Properties Ionization Energy a 1st IE atom g atom g e IV b 2nd IE atom g atom2 g 2ec 3rd IE atom g atom3 g 3ed ConcepTest Which pair of atoms in a single period would be expected to have the smallest and the largest electron attachment enthalpies respectively i Li Na ii Li F iii F Li iv Li Be v O F 1 ANSWER Li F 2 REASONING Largest range covered there is a lot of incentive to gain an electron from a halogen a Electron attachment enthalpies given as a negative number Atomic Properties Ion Sizes a Trends for ions are the same as atoms b Cations shrink anions expand i charge smaller than corresponding atom ii charge larger than their corresponding atom
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