Name: John Hendrie College ID:0571667 Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.:10 Semester and year: Jan2018 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) Lithium has one valence electron 1s2 (2s1) = 1, magnesium has 2 valence electrons (3s2) 2 electrons in outer shell, aluminum has 3 valence electrons 3s2 3p1 = 3, silicon has 4 valence electrons 3s2 3p2 = 4 electrons, phosphorus has 5 valence electrons 3s2 3p3 = 6 electrons , sulfur has 6 valence electrons 3s2 3p4 = 6 electrons, chlorine has 7 valence electrons 3s2 3p5 = 7 electrons. (Reference: Chang 9.2) 2.Explain the following: (3 points) a. Ionic bond- Electrostatic force that holds ions together in an ionic compound. b. Nonpolar covalent bond- Electrons are shared equally between the two atoms. c. Polar covalent bond- The electrons spend more time in the vicinity of one atom than the other. 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 is larger than LiF.
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