hw 4 answers - Iype Shelby Homework 4 Due midnight Inst...

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Iype, Shelby – Homework 4 – Due: Sep 25 2007, midnight – Inst: Vandenbout 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This homework should get you into the first 6 sections of Chapter 13 in your textbook. 001 (part 1 of 1) 10 points Which of the following statements is true? 1. The electronegativity of an atom is de- fined as 1 2 (Electron Affinity) of the atom. 2. Atoms with low ionization energies and low electron affinities have high electronega- tivities. 3. Atoms with high ionization energies and high electron affinities are highly electronega- tive. correct 4. The electronegativity of an atom depends only on the value of the ionization energy of the atom. 5. Atoms with high ionization energies and high electron affinities have low electronega- tivities. Explanation: Atoms with high ionization energies do not readily give up electrons to form positive ions. For these atoms it is usually favorable to gain electrons to form negative ions, so electron affinities and electronegativities tend to be large. In Mulliken’s scale, electronegativity = 1 2 (First Ionization Energy + Electron Affin- ity). 002 (part 1 of 1) 10 points If the following crystallize in the same type of structure, which has the lowest lattice energy? 1. NaI 2. NaCl 3. KCl 4. KI correct 5. LiCl Explanation: Lowest charge densities due to larger size. 003 (part 1 of 1) 10 points In general, electronegativity tends to decrease 1. from top to bottom and from left to right on the periodic table. 2. from top to bottom and from right to left on the periodic table. correct 3. in no regular trend.
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