Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: OL009 Semester and year: 2016DEC Written Assignment 9: Chemical Bonding Answer all assigned questions and problems, and show all work. 1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number. (8 points) (Reference: Chang 9.2) Li has 1 valence electron Cl has 7 valence electrons 2.Explain the following: (3 points) a. ionic bond the bond between non-metal and metal materials and they donate and accept the electron as they need. b. nonpolar covalent bond electrons are shared equally between the two atoms c. polar covalent bond a bond between atoms where electrons that have differentcharges unevenly share electrons 3. Specify which compound in the following pairs of ionic compounds has the higher lattice energy: Explain your choice. (6 points) a. KCl or MgO MgO as each ion is +2 b. LiF or LiBr LiBr, LiBr is bigger and softer c. Mg 3 N 2 or NaCl NaCl is stronger because Mg 3 N 2 has three neutral atoms. (Reference: Chang 9.23) 4. Compare the properties of ionic compounds and covalent compounds. (6 points) 1 Copyright © 2016 by Thomas Edison State University . All rights reserved.
(Reference: Chang 9.32)
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