CHEM 251 1st Edition Lecture 5 Outline of Last Lecture I. Clicker QuestionII. Effective Nuclear ChargeIII. Rationalizing Periodic TrendsIV. Nuclear PowerOutline of Current Lecture V. Problem SessionCurrent LectureV. Problem Sessiona. Identify Missing Elementsb. Which element has the highest electron affinity?i. Naii. Cliii. Siiv. HeAnswer: Cl-easiest to add an electronThese 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.c. Noble gas electron configuration of SbAnswer: [Kr]5s24d105p3d. What is the Zeff felt by a 3s electron in Ar?Answer: 6.75e. Group Questionsi. Coinage metals: Group 11ii. Transition metal w/ no stable isotope: Tciii. Another spot for Helium: next to H, above Beiv. Explain why C has electron affinity of 154 kJ/mol and N has an electron affinity of 7 kJ/mol1. In N, need to pay “pairing energy” f. Calculate Zeff for an electroni. In a 4s orbital of Fe1. Answer: 3.75ii. In a 3d orbital of Fe1. Answer:
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