Chapter 4 ANSWER KEY - Quia

Chapter 4 Structures and Properties ofSubstancesSolutions for Practice ProblemsStudent Textbook pages 165 electron configurations for the following:(a)Li+(b)Ca2+(c)Br (d)O2 SolutionFirst determine the atomic number of the ion, and then add or subtract electrons tomatch the charge indicated on the ion. Use the aufbau process to write the completeelectron configuration of the ion.(a)Li+:Z=3, subtract one electron for +1charge; 1s2(b)Ca2+:Z=20, subtract two electrons for +2 charge; 1s22s22p63s23p6(c)Br :Z=35, add one electron for charge of 1; 1s22s22p63s23p64s23d104p6(d)O2 :Z=8, add two electrons for charge of 2; 1s22s22p6 Check Your SolutionA check of the sequence of orbitals shows that the aufbau process was followed correctly. The number of electrons in each electron configuration matches the difference of Z (net charge on ion).

Chapter 4 Structures and Properties of Substances Solutions for Practice Problems Student Textbook pages 165–166 1. Problem Write electron configurations for the following:

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