Select one a Rb Sr2 S2 Br b Se2 Br c Se2 Sr2 Br d Se2 Sr2 Br Ar e Sr2 Br Ar The

Select one a rb sr2 s2 br b se2 br c se2 sr2 br d se2

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Which atoms or ions from the following are isoelectronic?: Select one: a. Rb, Sr2+, S2-, Br- b. Se2-, Br- c. Se2-, Sr2+, Br- d. Se2-, Sr2+, Br-, Ar e. Sr2+, Br-, Ar The correct answer is: Se2-, Sr2+, Br- Which of the following is a basic oxide? Select one: a. P O b. MgO c. Al O d. SO e. Cl O The correct answer is: MgO The total number of bonding electrons in a molecule of formaldehyde (H CO) is Select one: a. 3. b. 4. c. 6. d. 8. e. 18. The correct answer is: 8. 4 10 2 3 2 2 7 2
4/17/2019 Graded Exam 3 4/10 Question 9 Correct 4.60 points out of 4.60 Question 10 Correct 4.60 points out of 4.60 The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent? Select one: a. Electron con²guration b. Valence electrons c. Atomic number d. Atomic mass e. Core electrons The correct answer is: Valence electrons How many total resonance structures can be drawn for the sulfate ion, SO ? Select one: a. 2 b. 3 c. 4 d. 5 e. 6 The correct answer is: 6 4 2–
4/17/2019 Graded Exam 3 5/10 Question 11 Incorrect 0.00 points out of 4.60 Question 12 Correct 4.60 points out of 4.60 Which pair of Lewis structures is not a pair of resonance structures? Select one: a. b. c. d. All of these pairs are resonance structures of the same species. e. None of these pairs is resonance structures of the same species. The correct answer is: Which molecule has a Lewis structure that does not obey the octet rule? Select one: a. N O b. CS c. PH d. CCl e. NO The correct answer is: NO 2 2 3 4 2 2
4/17/2019 Graded Exam 3 6/10 Question 13 Correct 4.60 points out of 4.60 Question 14 Correct 4.60 points out of 4.60 Question 15 Correct 4.60 points out of 4.60 Select the compound with the lowest (i.e., least negative) lattice energy.

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