Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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How many valence electrons are in an atom of magnesium?
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2.
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How many valence electrons does a helium atom have?
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3.
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How does calcium obey the octet rule when reacting to form compounds?
a. | It gains electrons. | b. | It gives up electrons. | c. | It does not change
its number of electrons. | d. | Calcium does not obey the octet
rule. |
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4.
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What is the charge on the strontium ion?
a. | 2– | b. | 1– | c. | 1 | d. | 2 |
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5.
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How many electrons does barium have to give up to achieve a noble-gas electron
configuration?
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6.
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What is the formula of the ion formed when potassium achieves noble-gas electron
configuration?
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7.
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Which of the following elements does NOT form an ion with a charge of 1  ? a. | fluorine | b. | hydrogen | c. | potassium | d. | sodium |
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8.
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How many electrons does nitrogen gain in order to achieve a noble-gas electron
configuration?
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9.
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What is the formula of the ion formed when phosphorus achieves a noble-gas
electron configuration?
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10.
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How does oxygen obey the octet rule when reacting to form compounds?
a. | It gains electrons. | b. | It gives up electrons. | c. | It does not change
its number of electrons. | d. | Oxygen does not obey the octet
rule. |
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11.
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What is the charge on the cation in the ionic compound sodium sulfide?
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12.
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What is the net charge of the ionic compound calcium fluoride?
a. | 2– | b. | 1– | c. | 0 | d. | 1 |
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13.
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What is the formula unit of sodium nitride?
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14.
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What is the formula unit of aluminum oxide?
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15.
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What is the name of the ionic compound formed from lithium and bromine?
a. | lithium bromine | b. | lithium bromide | c. | lithium
bromium | d. | lithium bromate |
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16.
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What is the formula for potassium sulfide?
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17.
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Which of the following pairs of elements is most likely to form an ionic
compound?
a. | magnesium and fluorine | b. | nitrogen and sulfur | c. | oxygen and
chlorine | d. | sodium and aluminum |
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18.
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Ionic compounds are normally in which physical state at room temperature?
a. | solid | b. | liquid | c. | gas | d. | plasma |
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19.
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What does the term coordination number in ionic crystals refer to?
a. | the total number of valence electrons in an atom | b. | the number of
oppositely charged ions surrounding a particular ion | c. | the number of atoms in a particular formula
unit | d. | the number of like-charged ions surrounding a particular
ion |
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20.
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Which of the following is NOT a characteristic of most ionic compounds?
a. | They are solids. | b. | They have low melting
points. | c. | When melted, they conduct an electric current. | d. | They are composed of
metallic and nonmetallic elements. |
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21.
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Which of the following particles are free to drift in metals?
a. | protons | b. | electrons | c. | neutrons | d. | cations |
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22.
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What is the basis of a metallic bond?
a. | the attraction of metal ions to mobile electrons | b. | the attraction
between neutral metal atoms | c. | the neutralization of protons by
electrons | d. | the attraction of oppositely charged ions |
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23.
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What characteristic of metals makes them good electrical conductors?
a. | They have mobile valence electrons. | b. | They have mobile protons. | c. | They have mobile
cations. | d. | Their crystal structures can be rearranged easily. |
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24.
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Which metallic crystal structure has a coordination number of 8?
a. | body-centered cubic | b. | face-centered cubic | c. | hexagonal
close-packing | d. | tetragonal |
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25.
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What is the electron configuration of the calcium ion?
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