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Unformatted text preview: padilla (tp5647) Homework 3 Sutcliffe (53770) 1 This print-out should have 27 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points List in order of increasing atomic size (small- est to largest) the atoms whose atomic num- bers are 6, 32, 7. 1. 32, 7, 6 2. 7, 6, 32 correct 3. 6, 7, 32 4. 32, 6, 7 Explanation: Element Electronic configuration 6 2 4 [He] 2 s 2 p Group 4, Period 2 Valence electrons in period 2 7 2 5 [He] 2 s 2 p Group 5, Period 2 Valence electrons in period 2 32 2 8 18 4 [Ar] 4 s 3 d 4 p Group 4, Period 4 Valence electrons in period 4 Period 4 is farther from the nucleus than period 2. The half-filled 2 p orbital of ele- ment #7 is energetically more stable and has greater effective nuclear charge than that of element #6. 002 10.0 points According to the general trends of the peri- odic table, which of the following elements has the largest atomic radius? 1. Cs correct 2. K 3. Kr 4. Ca Explanation: Following the general pattern, which is that atomic sizes are largest in the bottom left- hand corner and smallest in the top right-hand corner of the periodic table, the largest atomic radius would belong to Cs in this group. 003 10.0 points In general, atomic size tends to increase 1. from top to bottom and from right to left on the periodic table. correct 2. from top to bottom and from left to right on the periodic table. 3. from bottom to top and from right to left on the periodic table. 4. from bottom to top and from left to right on the periodic table. 5. There is no relationship between the size of an atom and its position on the periodic table. Explanation: Atomic sizes are largest in the bottom left- hand corner and smallest in the top right-hand corner of the periodic table. 004 10.0 points Phosphorus has a higher ionization energy than silicon because 1. False; phosphorus has a lower ionization energy than silicon. 2. the outer orbitals of phosphorus are lo- cated closer to the nucleus than the outer orbitals of silicon. 3. the effective nuclear charge of silicon is less than that of phosphorus. correct 4. the outer orbitals of phosphorus are lo- cated farther from the nucleus than the outer padilla (tp5647) Homework 3 Sutcliffe (53770) 2 orbitals of silicon. 5. the effective nuclear charge of phosphorus is less than that of silicon. Explanation: 15 P : [Ne] 3 s 3 p 14 Si : [Ne] 3 s 3 p In both cases, the valence electrons are lo- cated in 3s and 3p orbitals. However, P has a greater nuclear charge due to its greater num- ber of protons, so more energy is required to remove an electron from P relative to Si....
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- Spring '08