True/False
Indicate whether the
statement is true or false.
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1.
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[Kr]5s24d105p5 is the correct electron configuration for the
element Bromine.
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2.
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Valence
refers to the total number of electrons that exist in the orbitals that occupy the outermost energy
level of an atom.
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3.
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The maximum number of allowed
valence electrons in any atom is 8.
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4.
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Elements in the same family
tend to have the same number of valence electrons.
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5.
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The octet rule states that
atoms will gain, lose, or share electrons to achieve a complete set of eight valence
electrons.
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6.
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The electronegativity of
elements increases from left to right and from top to bottom on the periodic
table.
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Multiple
Choice
Identify the letter
of the choice that best completes the statement or answers the question.
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7.
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How many electrons are needed
to fill the third main energy level if it already contains 8 electrons?
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8.
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The electron configuration for
the carbon atom (C) is 1s2 2s2 2p2. The atomic number of
carbon is
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9.
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What is the electron
configuration for nitrogen, atomic number 7?
a. | 1s2 2s2
2p3 | c. | 1s2 2s3
2p1 | b. | 1s2 2s3
2p2 | d. | 1s2 2s2
2p2 3s1 |
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10.
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The electron notation for
aluminum (atomic number 13) is
a. | 1s2 2s2
2p3 3s2 3p3
3d1. | c. | 1s2 2s2 2p6 3s2
3p1. | b. | 1s2 2s2 2p6 3s2
2d1. | d. | 1s2 2s2
2p9. |
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11.
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If an element has an octet of
electrons in its highest main energy level, there are ____ electrons in this
level.
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12.
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An element with 8 electrons in
its highest main energy level is a(n)
a. | octet
element. | c. | Aufbau
element. | b. | third period element. | d. | noble gas. |
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13.
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Which is the correct number of
valence electrons in the element Gallium (Ga)?
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14.
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Which is the correct number of
valence electrons in the element Sulfur (S)?
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15.
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Which element has the electron
configuration 1s22s22p63s23p64s23d4?
a. | Titanium
(Ti) | c. | Sulfur
(S) | b. | Chromium (Cr) | d. | Selenium (Se) |
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16.
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Which is the correct electron
dot diagram for the element Silicon (Si)?
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17.
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Mendeleev predicted that the
spaces in his periodic table represented
a. | isotopes. | c. | permanent gaps. | b. | radioactive elements. | d. | undiscovered elements. |
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18.
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Argon, krypton, and xenon
are
a. | alkaline earth
metals. | c. | actinides. | b. | noble gases. | d. | lanthanides. |
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19.
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Which two periods have the same
number of elements?
a. | 2 and 4 | c. | 4 and 5 | b. | 3 and 4 | d. | 5 and 6 |
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20.
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The electron configuration of
cesium, atomic number 55, is [Xe] 6s1. In what period is cesium?
a. | Period
1 | c. | Period
8 | b. | Period
6 | d. | Period 55 |
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21.
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The period of an element can be
determined from its
a. | reactivity. | c. | symbol. | b. | density. | d. | electron configuration. |
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22.
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Elements to the right side of
the periodic table (p-block
elements) have properties most associated with
a. | gases. | c. | metals. | b. | nonmetals. | d. | metalloids. |
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23.
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The elements whose electron
configurations end with s2 p5 in the highest occupied energy level belong
to Group
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24.
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Strontium's highest
occupied energy level is 5s2. To what group does strontium belong?
a. | Group 2 | c. | Group 6 | b. | Group 4 | d. | Group 8 |
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25.
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Nitrogen's electron
configuration is 1s2
2s2 2p3. To what group does nitrogen belong?
a. | Group 2 | c. | Group 15 | b. | Group 7 | d. | Group 17 |
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26.
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Bromine, atomic number 35,
belongs to Group 17. How many electrons does bromine have in its outermost energy
level?
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27.
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The first member of the noble
gas family, whose highest energy level consists of an octet of electrons, is
a. | helium. | c. | neon. | b. | argon. | d. | krypton. |
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28.
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A measure of the ability of an
atom in a chemical compound to attract electrons is called
a. | electron
affinity. | c. | electronegativity. | b. | electron configuration. | d. | ionization potential. |
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29.
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A positive ion is known as
a(n)
a. | ionic
radius. | c. | cation. | b. | valence electron. | d. | anion |
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30.
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A negative ion is known as
a(n)
a. | ionic
radius. | c. | cation. | b. | valence electron. | d. | anion. |
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31.
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The energy required to remove
an electron from an atom ____ as you move left to right from potassium through
iron.
a. | generally
increases | c. | does not
change | b. | generally decreases | d. | varies unpredictably |
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32.
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Valence electrons are
those
a. | closest to the
nucleus. | c. | in the highest
energy level. | b. | in the lowest energy level. | d. | combined with protons. |
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33.
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The number of valence electrons
in Group 17 elements is
a. | 7. | c. | 17. | b. | 8. | d. | equal to the period number. |
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34.
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Which element has an electron
configuration that ends in the fourth energy level?
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35.
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Which element is the most
metallic?
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36.
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Which of the following elements
is a metal?
a. | Boron | c. | Magnesium | b. | Nitrogen | d. | Carbon |
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Short Answer
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37.
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Place these five elements in
order of electronegativity, with the highest electronegativity first.
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