H05 Bonding 2 - saldana(avs387 H05 Bonding 2 Mccord(52385...

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saldana (avs387) – H05: Bonding 2 – Mccord – (52385) 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 10.0 points How many valence electrons are in a Li atom? 1. 1 correct 2. 3 3. 2 4. 6 5. 9 Explanation: Valence electrons are electrons that are found in the outermost energy levels of an atom. For Li, Atomic number : 3 Electronic configuration : [He] 2 s 1 Shell Structure : 2 - 1 Therefore, Li has 1 valence electrons. 002 10.0 points The P 2 - anion has how many total electrons and how many valence electrons? 1. 15; 6 2. 15; 7 3. 17; 7 correct 4. 16; 7 5. 16; 5 6. 17; 6 7. 17; 8 8. 18; 8 9. 15; 5 10. 16; 6 Explanation: P 2 - has gained 2 electrons to give it a total of 17. In its valence, it has 3 s 2 3 p 5 , giving it a total of 7 valence electrons. 003 10.0 points What total number of valence electrons should appear in the dot formula for the chlo- rate ion ClO - 3 ? 1. 24 2. 26 correct 3. 32 4. 28 5. 30 Explanation: Chlorine has 7 valence electrons and oxy- gen 6. The overall - 1 charge indicates that there is 1 extra electron. The total number of valence electrons is 1 × 7 e - (from Cl) + 3 × 6 e - (from O) +1 e - (from - 1 charge) = 26 e - 004 10.0 points Which of the following is the best represen- tation of the compound calcium sulfide? 1. Ca 2+ , bracketleftbigg S bracketrightbigg 2 - correct 2. Ca + , bracketleftbigg S bracketrightbigg - 3. 2 Ca + , bracketleftbigg S bracketrightbigg 2 - 4. None is appropriate because calcium sul- fide is a covalent compound. 5. Ca 2+ , 2 bracketleftbigg S bracketrightbigg -
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saldana (avs387) – H05: Bonding 2 – Mccord – (52385) 2 6. 3 Ca 2+ , 2 bracketleftbigg S bracketrightbigg 3 - Explanation: The metal loses all of its outer (valence) electrons; the non-metal gains sufficient elec- trons to form an octet. The ratio of the negative and positive ions is chosen so there is no overall charge. 005 10.0 points Which of the following is the correct Lewis formula for oxygen (O 2 )? 1. O O 2. O O correct 3. O O 4. O O 5. O O 6. O O 7. O O 8. O O Explanation: N = 8 × 2 = 16 A = 6 × 2 = 12 S = N - A = 16 - 12 = 4 There are 4 shared electrons. The remain- ing electrons are placed around the oxygen atoms such that each has an octet.
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