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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-, Are. Sr2+, Br-, ArThe correct answer is: Se2-, Sr2+, Br-Which of the following is a basic oxide?Select one:a. POb. MgO c. AlOd. SOe. ClOThe correct answer is: MgOThe total number of bonding electrons in a molecule of formaldehyde (HCO) isSelect one:a. 3.b. 4.c. 6.d. 8. e. 18.The correct answer is: 8.410232272
4/17/2019Graded Exam 34/10Question 9Correct4.60 points outof 4.60Question 10Correct4.60 points outof 4.60The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot ordots represent?Select one:a. Electron con²gurationb. Valence electrons c. Atomic numberd. Atomic masse. Core electronsThe correct answer is: Valence electronsHow many total resonance structures can be drawn for the sulfate ion, SO?Select one:a. 2b. 3c. 4d. 5e. 6 The correct answer is: 642–
4/17/2019Graded Exam 35/10Question 11Incorrect0.00 points outof 4.60Question 12Correct4.60 points outof 4.60Which 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. NOb. CSc. PHd. CCle. NOThe correct answer is: NO223422
4/17/2019Graded Exam 36/10Question 13Correct4.60 points outof 4.60Question 14Correct4.60 points outof 4.60Question 15Correct4.60 points outof 4.60Select the compound with the lowest (i.e., least negative) lattice energy.