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Dr. L. Dawe Chemistry 1050 Winter 2011 February 10, 2011 – Class 20 • Section 8.12 (Page 344 – 348): Electron Configurations and the Periodic Table – • The s, p, d, and f blocks; Cu and Cr as exceptions to the ideal order of filling Suggested end-of-chapter exercises: 71, 75, 77, 79, 81, 83, 87, 91(b), 91(c), 105 Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of numbers in the periodic table below corresponds to the group of elements in which the 2p orbitals are being filled. 1 3 4 2 5 Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of numbers in the periodic table below corresponds to the group of elements in which the 2p orbitals are being filled. 3s 4s 1 3 4 2 5 3p 4p Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of numbers in the periodic table below corresponds to the group of elements in which the 4d orbitals are being filled. 1 2 3 4 5 Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of numbers in the periodic table below corresponds to the group of elements in which the 4d orbitals are being filled. 3d 5d 4f 5f 1 2 3 4 5 Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of the following is the condensed electron configuration for chlorine? 1. [Ne]3p7 2. [Ne]3s23p5 3. [Ne]3s23p6 4. [Ne]3s23d5 5. [Ne]3s23p33d2 Dr. L. Dawe Chemistry 1050 Winter 2011 Electron Configuration and the Periodic Table Which of the following is the condensed electron configuration for chlorine? 17 electrons 1. [Ne]3p7 2. [Ne]3s23p5 3. [Ne]3s23p6 4. [Ne]3s23d5 5. [Ne]3s23p33d2 Note: 1 is impossible (p-orbitals can hold a maximum of 6 electrons), 4 and 5 are not ground state configurations, while 3 has 18 electrons. Dr. L. Dawe Chemistry 1050 Winter 2011 Looking Ahead - February 14, 2011 Chapter 9 • Section 9.1 (Page 361 – 364): Classifying the Elements: The Periodic Law and the Periodic Table – • Atomic number a basis for periodic law, main group and transition elements. The long form of the periodic table. Section 9.2 (Page 364 – 367): Metals and Nonmetals and Their Ions – Relationship between valence electron configuration and chemical and physical properties of elements, Electron configurations of Noble gases, main-group metal ions and nonmetal ions, transition metal ions.