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HW03 Quy

# HW03 Quy - perlick(app582 HW03 quy(50970 1 This print-out...

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perlick (app582) – HW03 – quy – (50970) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Let X be a hypothetical element. Which of the following would be largest? 1. X + 2. X 2+ 3. X - 4. X 5. X 2 - correct Explanation: X 2 - would be largest as it has 2 more electrons than protons, and the protons here would be at the greatest disadvantage when trying to draw the electrons towards the nu- cleus. 002 10.0points In general, electronegativity tends to decrease 1. from bottom to top 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. from top to bottom and from left to right on the periodic table. 4. in no regular trend. 5. from bottom to top and from right to left on the periodic table. Explanation: Electronegativity generally increases from left to right and from bottom to top of the Periodic Table. 003 10.0points Which of the following statements is true? 1. Atoms with low ionization energies and low electron affinities have high electronega- tivities. 2. Atoms with high ionization energies and high electron affinities are highly electronega- tive. correct 3. The electronegativity of an atom is de- fined as 1 2 (Electron Affinity) of the atom. 4. Atoms with high ionization energies and high electron affinities have low electronega- tivities. 5. The electronegativity of an atom depends only on the value of the ionization energy of the atom. 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).

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