{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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? 1. 2.92 nm. 2. 0.541 nm. correct 3. 0.303 nm. 4. 292 nm. 5. 4.32 nm. 6. 1.14 nm. 7. 322 nm. 8. 0.151 nm. 9. 1.61 nm. Explanation: 007 10.0 points How many electrons can possess this set of quantum numbers: principal quantum num- ber n = 4, angular quantum number = 2?
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}