Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The smallest particle into which an element can be divided and still be the same
substance is called a(n)
A. | nucleus. | C. | atom. | B. | electron. | D. | neutron. |
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2.
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How would you describe the nucleus?
A. | dense, positively charged | C. | tiny, negatively
charged | B. | large, positively charged | D. | dense, negatively charged |
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3.
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Where are electrons likely to be found?
A. | the nucleus | C. | mixed throughout an atom | B. | electron
clouds | D. | paths, or energy
levels |
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4.
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What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in
common?
A. | They each identified new elements. | B. | They each identified new isotopes of
atoms. | C. | They each contributed to the development of the atomic theory. | D. | They each conducted
experiments in which particles collided. |
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5.
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An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a
mass number of
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6.
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Which of the following has the least mass?
A. | nucleus | C. | neutron | B. | proton | D. | electron |
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7.
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If an isotope of uranium, uranium-235, has 92 protons, how many protons does
uranium-238 have?
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8.
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An atom of carbon with 6 protons, 6 electrons, and 6 neutrons would have a mass
number of
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9.
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If hydrogen-1 has 1 proton, how many protons does hydrogen-2 have?
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10.
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Periodic means
A. | happening at regular intervals. | C. | happening
frequently. | B. | happening very rarely. | D. | happening three or four times a year. |
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11.
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Each vertical column on the periodic table is called a(n)
A. | period. | C. | element. | B. | group. | D. | property. |
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12.
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The elements to the right of the zigzag line on the periodic table are
called
A. | nonmetals. | C. | metalloids. | B. | metals. | D. | conductors. |
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13.
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Most metals are
A. | solid at room temperature. | C. | dull. | B. | bad conductors of
electric current. | D. | not
malleable. |
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14.
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Most of the elements in the periodic table are
A. | metals. | C. | gases. | B. | metalloids. | D. | nonmetals. |
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15.
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Mendeleev arranged the elements by
A. | density. | C. | appearance. | B. | melting point. | D. | increasing atomic
mass. |
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16.
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The horizontal row on the periodic table is called a(n)
A. | group. | C. | period. | B. | family. | D. | atomic number. |
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Use the figure below to answer the following questions.
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17.
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Which of the following elements is the most metallic?
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18.
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Which of these elements is the least metallic?
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19.
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Which element group has all nonmetals?
A. | K, Ca, Sc | C. | V, Cr, Mn | B. | Se, Br, Kr | D. | As, Se, Br |
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Refer to the figure below to answer the
following questions.
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20.
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The number beneath carbon indicates the
A. | atomic number. | C. | chemical symbol. | B. | atomic mass. | D. | element name. |
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21.
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The number at the top is the
A. | atomic number. | C. | atomic mass. | B. | element name. | D. | chemical
symbol. |
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Completion
Complete each
statement.
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Use the terms from the following list to complete the sentences
below.
| atom | atomic
number | | nucleus | atomic
mass | | proton | isotope | | electron | electron cloud | | neutron | | | |
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22.
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A positively charged particle in the nucleus of an atom is called a(n)
____________________.
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23.
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An atom of an element that has the same number of protons but different numbers
of neutrons is called a(n) ____________________.
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24.
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The region in an atom that contains most of the mass is called
the____________________.
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25.
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The number of protons in an atom determines its ____________________.
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26.
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The weighted average of all the naturally occurring isotopes of an element is
called the ____________________.
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27.
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The smallest particle into which an element can be divided and still be the same
substance is a(n) ____________________.
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Use the terms from the following list to complete the sentences
below.
| electrons | electron-cloud | | nucleus | atoms | | isotopes | protons | | |
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28.
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Thomson discovered the negatively charged particles called
____________________.
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29.
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Rutherford believed that each atom has a(n) ____________________ at its
center.
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30.
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The current atomic theory includes the ____________________ model.
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31.
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All substances are made of ____________________.
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32.
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Isotopes always have the same number of ____________________.
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33.
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Most elements have a mixture of two or more ____________________.
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Short Answer
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Use the diagram below to answer the following four questions.
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34.
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Which letter refers to the negatively charged particles?
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35.
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Which letter refers to the positively charged particles?
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36.
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Which letter refers to the particles with no charge?
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37.
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Which letter refers to the dense center of the atom?
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