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Atoms of elements with low ionization energies tend to form ________ while those with positive electron affinities tend to form ________.

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The Lewis dot symbol for the calcium ion is


A) The Lewis dot symbol for the calcium ion is A) B) C) D) Ca<sup>2+</sup> E) Ca
B) The Lewis dot symbol for the calcium ion is A) B) C) D) Ca<sup>2+</sup> E) Ca
C) The Lewis dot symbol for the calcium ion is A) B) C) D) Ca<sup>2+</sup> E) Ca
D) Ca2+
E) Ca

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

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How many dots does the Lewis dot symbol for carbon have around it?


A) 4
B) 2
C) 6
D) 3
E) 7

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

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The Lewis dot symbol for the chloride ion is


A) The Lewis dot symbol for the chloride ion is A) B) C) D) E) Cl<sup>-</sup>
B) The Lewis dot symbol for the chloride ion is A) B) C) D) E) Cl<sup>-</sup>
C) The Lewis dot symbol for the chloride ion is A) B) C) D) E) Cl<sup>-</sup>
D) The Lewis dot symbol for the chloride ion is A) B) C) D) E) Cl<sup>-</sup>
E) Cl-

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

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The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.


A) increases, increases
B) increases, decreases
C) decreases, increases
D) decreases, decreases
E) None of these is generally correct.

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

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In which one of the following structures does the central atom have a formal charge of +2?


A) In which one of the following structures does the central atom have a formal charge of +2? A) B) C) D) E)
B) In which one of the following structures does the central atom have a formal charge of +2? A) B) C) D) E)
C) In which one of the following structures does the central atom have a formal charge of +2? A) B) C) D) E)
D) In which one of the following structures does the central atom have a formal charge of +2? A) B) C) D) E)
E) In which one of the following structures does the central atom have a formal charge of +2? A) B) C) D) E)

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

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Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.


A) Select the Lewis structure for XeO<sub>2</sub>F<sub>2</sub> which correctly minimizes formal charges. A) B) C) D) E)
B) Select the Lewis structure for XeO<sub>2</sub>F<sub>2</sub> which correctly minimizes formal charges. A) B) C) D) E)
C) Select the Lewis structure for XeO<sub>2</sub>F<sub>2</sub> which correctly minimizes formal charges. A) B) C) D) E)
D) Select the Lewis structure for XeO<sub>2</sub>F<sub>2</sub> which correctly minimizes formal charges. A) B) C) D) E)
E) Select the Lewis structure for XeO<sub>2</sub>F<sub>2</sub> which correctly minimizes formal charges. A) B) C) D) E)

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

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The number of resonance structures for the nitrate ion that satisfy the octet rule is


A) 1.
B) 2.
C) 3.
D) 4.
E) none of these

F) B) and C)
G) C) and E)

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Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.


A) Hydrazine, N<sub>2</sub>H<sub>4</sub>, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. A) B) C) D) E) None of the choices is correct.
B) Hydrazine, N<sub>2</sub>H<sub>4</sub>, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. A) B) C) D) E) None of the choices is correct.
C) Hydrazine, N<sub>2</sub>H<sub>4</sub>, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. A) B) C) D) E) None of the choices is correct.
D) Hydrazine, N<sub>2</sub>H<sub>4</sub>, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure. A) B) C) D) E) None of the choices is correct.
E) None of the choices is correct.

F) A) and E)
G) A) and C)

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Which of these elements is most likely to exhibit an expanded octet in its compounds?


A) O
B) S
C) Na
D) C
E) N

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

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A single bond between two atoms represents ________ pair(s) of electrons.

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How many dots does the Lewis dot symbol for sodium have around it?


A) 1
B) 2
C) 0
D) 3
E) 11

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

Correct Answer

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What is the formal charge on the fluorine in ClF2+?


A) -1
B) +1
C) 0
D) -2
E) -3

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

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Lewis theorized the octet rule to describe chemical bonding where atoms lose, gain, or share electrons in order to achieve a noble gas configuration.

A) True
B) False

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Unshared electrons are always shown in pairs around an atom.

A) True
B) False

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In which one of the following is the best Lewis structure a resonance structure?


A) SO3
B) BF3
C) I3-
D) SCO (C = central atom)
E) SO32-

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

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Ionic compounds may carry a net positive or net negative charge.

A) True
B) False

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Which of the following contains covalent bonds?


A) BaO
B) IBr
C) Mg
D) LiBr
E) Cu

F) B) and E)
G) A) and B)

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Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is


A) +2.
B) +1.
C) 0.
D) -1.
E) -2.

F) A) and B)
G) A) and E)

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Which pair of Lewis structures is not a pair of resonance structures?


A) Which pair of Lewis structures is not a pair of resonance structures? 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.
B) Which pair of Lewis structures is not a pair of resonance structures? 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.
C) Which pair of Lewis structures is not a pair of resonance structures? 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.
D) All of these pairs are resonance structures of the same species.
E) None of these pairs is resonance structures of the same species.

F) A) and C)
G) D) and E)

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