Chem301 - Exam 1 - Version 474 Exam 1 Mccord (50970) 1 This...

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Unformatted text preview: Version 474 Exam 1 Mccord (50970) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Write the ground-state electron configuration of a lead atom. 1. [Xe] 4 f 14 5 d 9 6 s 2 6 p 3 2. [Xe] 4 f 14 5 d 10 6 s 2 6 p 2 correct 3. [Xe] 4 f 14 5 d 10 6 p 4 4. [Xe] 4 f 14 5 d 5 6 s 1 6 p 6 7 s 2 5. [Xe] 4 f 14 5 d 10 6 s 1 6 p 3 Explanation: The Aufbau order of electron filling is 1 s , 2 s , 2 p , 3 s , 3 p , 4 s , 3 d , 4 p , 5 s , 4 d , 5 p , 6 s , 4 f , 5 d , 6 p , etc . s orbitals can hold 2 electrons, p orbitals 6 electrons, and d orbitals 10 electrons. Note some exceptions do occur in the electron con- figuration of atoms because of the stability of either a full or half-full outermost d-orbital, so you may need to account for this by shuffling an electron from the ( n- 1) s orbital. Finally use noble gas shorthand to get the answer: [Xe] 4 f 14 5 d 10 6 s 2 6 p 2 . 002 10.0 points In a many-electron atom, any two electrons 1. have the same energy. 2. have a different energy. 3. can have either the same or a different energy. correct Explanation: Energy is determined by distance. Elec- trons can have the same energy (distance from the nucleus) but have different sets of quan- tum numbers. 003 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. 7, 6, 32 correct 2. 32, 7, 6 3. 32, 6, 7 4. 6, 7, 32 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. 004 10.0 points How many s electrons and p electrons does Mn possess? 1. 7 s , 13 p 2. 7 s , 18 p 3. 6 s , 6 p 4. 8 s , 12 p correct 5. 6 s , 12 p Version 474 Exam 1 Mccord (50970) 2 6. 7 s , 12 p 7. 8 s , 6 p 8. 6 s , 18 p 9. 8 s , 18 p Explanation: The electron configuration for Mn is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 5 2 + 2 + 2 + 2 = 8 s 6 + 6 = 12 p 005 10.0 points What is the electronic configuration of Hg? 1. [Xe] 6 s 2 5 d 10 2. [Xe] 6 s 2 4 f 14 5 d 10 correct 3. [Xe] 6 s 3 4 f 14 5 d 9 4. [Rn] 6 s 2 4 f 14 5 d 10 5. [Kr] 5 s 3 4 d 9 Explanation: 006 10.0 points An electron is confined to a one-dimensional box of length L. It falls from the second en- ergy level to the ground state, and releases a photon with a wavelength of 322 nm. What is the length of the box?...
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Chem301 - Exam 1 - Version 474 Exam 1 Mccord (50970) 1 This...

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