Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
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1.
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The central
core of an atom is called the hub. _________________________
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2.
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The chart
showing the classifications of elements according to their properties and increasing atomic numbers
is called the periodic table. _________________________
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3.
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The mass of
an electron is about equal to the mass of a proton. _________________________
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4.
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Elements
arranged in vertical columns in the periodic table are called periods.
_________________________
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5.
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The region
around the nucleus occupied by the electrons is called the negative zone.
_________________________
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6.
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The symbol
for chlorine is C. _________________________
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7.
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The maximum
number of electrons in the second energy level of an atom is 4.
_________________________
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8.
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Two isotopes
of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons.
_________________________
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9.
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Metals are
good conductors of heat and electricity. _________________________
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10.
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Scientists
believe that naturally occurring elements are manufactured within Mars.
_________________________
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11.
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So far,
scientists have confirmed the existence of six different quarks.
_________________________
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12.
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In 1926,
scientists developed the Bohr model of the atom that is in use today.
_________________________
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13.
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The sum of
the number of protons and neutrons in an atom is the mass number.
_________________________
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14.
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The symbol
for fluorine is Fe. _________________________
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15.
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A very
stable electron arrangement in the outer energy level is characteristic of noble gases.
_________________________
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16.
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One proton
and one electron are added to each element as you go across the periodic table.
_________________________
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17.
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Electron
cloud models are used to show how electrons in the outer energy level are bonded when elements
combine to form compounds. _________________________
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18.
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The atomic
number of an element is determined by its number of protons.
_________________________
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19.
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According to
present atomic theory, the location of an electron in an atom cannot be pinpointed exactly.
_________________________
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20.
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Moving from
left to right in a row of the periodic table, metallic properties increase.
_________________________
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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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21.
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Each inner
energy level of an atom has a maximum number of ____ it can hold. a. | electrons | c. | quarks | b. | neutrons | d. | protons | | | | |
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22.
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Dot diagrams
are used to represent ____. a. | atomic numbers | c. | isotopes | b. | atomic mass | d. | outer level electrons | | | | |
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23.
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Particles of
matter that make up protons and neutrons are ____. a. | electrons | c. | quarks | b. | isotopes | d. | atoms | | | | |
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24.
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A chemical
symbol represents the ____ of an element. a. | name | c. | group | b. | reaction | d. | structure | | | | |
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25.
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Horizontal
rows of the periodic table are called ____. a. | clusters | c. | groups | b. | families | d. | periods | | | | |
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26.
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Atoms of the
same element with different numbers of neutrons are called ____. a. | isotopes | c. | metalloids | b. | metals | d. | radioactive elements | | | | |
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27.
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A particle
that moves around the nucleus is a(n) ____. a. | electron | c. | neutron | b. | proton | d. | quark | | | | |
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28.
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Elements
that are gases, are brittle, and are poor conductors at room temperature are ____. a. | metals | c. | metalloids | b. | nonmetals | d. | isotopes | | | | |
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29.
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A ____ is
used to accelerate protons in the study of subatomic particles. a. | tevatron | c. | technology | b. | termanite | d. | television | | | | |
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30.
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A certain
atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.
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