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Unformatted text preview: padilla (tp5647) HW05: Bonding Part I shear (52375) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The trends associated with columns of the periodic table 1. can generally be rationalized based on the effective nuclear charge and degree of shield- ing. 2. always increase from bottom to top. 3. are related to the distance of the orbitals from the nuclei. correct 4. are less important relative to trends asso- ciated with rows. 5. are related to the electronegativity of the atoms. Explanation: Going down the Periodic Table, the value of the principal quantum number n increases and the orbitals are located farther from the nucleus of the atom. 002 10.0 points Electron affinity corresponds to the energy released or absorbed in which process (for atom A)? 1. None of these 2. A + e- A- correct 3. A 50 electron volt electron collides with A to give A + + 2 e- . 4. A A + + e- 5. A A + + 2 e- Explanation: Electron affinity is defined as the amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a- 1 charge. This is represented by the equation A + e- A- . 003 10.0 points Arrange the ions Be 2+ , F- , Mg 2+ , S 2- , Cl- in order of increasing size. 1. S 2- , F- , Cl- , Mg 2+ , Be 2+ 2. Be 2+ , Mg 2+ , F- , Cl- , S 2- correct 3. Be 2+ , F- , Mg 2+ , S 2- , Cl- 4. F- , Be 2+ , Mg 2+ , Cl- , S 2- 5. Impossible to predict. Explanation: Ionic size increases going down the Periodic table. For an isoelectronic series of ions, the more electrons lost the smaller the ion and the more electrons gained the larger the ion. 004 10.0 points Let X be a hypothetical element. Which of the following would be largest? 1. X 2- correct 2. X + 3. X 4. X 2+ 5. X- 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. 005 10.0 points The oxygen atom is smaller than the sulfur atom because 1. the outer electrons of oxygen are less padilla (tp5647) HW05: Bonding Part I shear (52375) 2 effectively screened from the nuclear charge than are sulfurs outer electrons. 2. the outer electrons of oxygen are more effectively screened from the nuclear charge than are sulfurs outer electrons....
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- Spring '09