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Consider the drawings below: Consider the drawings below: Which of the following statements are true? I. The electrons in each molecule tend to be attracted to the most electronegative element. II) Each molecular drawing follows the localized electron model. III) Both HF and CO<sub>2</sub> are linear molecules and therefore nonpolar. IV) The bond angles of NH<sub>3</sub> are slightly less than 109.5<sup>o</sup> because the lone pair compresses the angles between the bonding pairs. A) I, III, IV B) I, II, IV C) I, II, III D) II, IV E) All of the above statements (I - IV) are correct. Which of the following statements are true? I. The electrons in each molecule tend to be attracted to the most electronegative element. II) Each molecular drawing follows the localized electron model. III) Both HF and CO2 are linear molecules and therefore nonpolar. IV) The bond angles of NH3 are slightly less than 109.5o because the lone pair compresses the angles between the bonding pairs.


A) I, III, IV
B) I, II, IV
C) I, II, III
D) II, IV
E) All of the above statements (I - IV) are correct.

F) B) and D)
G) C) and D)

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Complete the table by giving the predicted formulas of the compounds formed between the elements listed. Br S Na ______________ ______________ Mg ______________ ______________ Al ______________ ______________

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Br
S
Na
Na...

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Which of the following has only nonpolar covalent bonds?


A) N2
B) CO
C) HI
D) CCl4
E) NaCl

F) B) and D)
G) B) and C)

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Which of the following has the smallest radius?


A) S2-
B) Cl-
C) Ar
D) K+
E) Ca2+

F) B) and D)
G) A) and B)

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Which of the following elements has the lowest electronegativity?


A) Sr
B) P
C) Mn
D) N
E) H

F) A) and B)
G) C) and D)

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Ionic bonding occurs between atoms with small differences in electronegativities.

A) True
B) False

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Would NaBr be classified as ionic or covalent?

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Which one of the following species has the same electron configuration as an atom of argon?


A) S-
B) Cl2-
C) K
D) Ca2+
E) Kr

F) All of the above
G) B) and C)

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Which of the following elements has the lowest electronegativity?


A) Cs
B) Na
C) Be
D) S
E) Br

F) None of the above
G) A) and D)

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Choose the correct Lewis structure for the OH- ion.


A) Choose the correct Lewis structure for the OH<sup>-</sup> ion. A) B) C) D)
B) Choose the correct Lewis structure for the OH<sup>-</sup> ion. A) B) C) D)
C) Choose the correct Lewis structure for the OH<sup>-</sup> ion. A) B) C) D)
D) Choose the correct Lewis structure for the OH<sup>-</sup> ion. A) B) C) D)

E) All of the above
F) B) and C)

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