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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Nonmetals are poor conductors of heat and electricity.
_______________
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10.
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Seven
electrons in the outermost energy level is characteristic of a metal.
_______________
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11.
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The
number of protons in an atom is called the atomic mass. _______________
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12.
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The
sum of the number of protons and neutrons in an atom is the mass number.
_______________
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13.
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The
weighted average of the mass numbers of all the isotopes that occur in nature for a particular
element is the average atomic number. _______________
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14.
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A
very stable electron arrangement in the outer energy level is characteristic of noble
gases. _______________
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15.
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Elements having three or fewer electrons in the outer energy level are classified as
nonmetals. _______________
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16.
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The
atomic masses of the elements are NOT whole number values because of the existence of
quarks. _______________
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17.
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The
identity of an element is determined by the number of protons.
_______________
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18.
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According to present atomic theory, the location of an electron in an atom is
best represented by a probability cloud. _______________
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19.
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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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20.
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Each
inner energy level of an atom has maximum numbers of _____ it can hold. a. | electrons | c. | quarks | b. | neutrons | d. | protons | | | | |
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21.
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Dot
diagrams are used to represent _____. a. | atomic numbers | b. | atomic
mass | c. | isotopes | d. | outer electrons | e. | the structure of
the nucleus | | |
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22.
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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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23.
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A
chemical symbol represents the _____ of an element. a. | name | b. | reaction | c. | group | d. | structure | e. | type | | |
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24.
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Horizontal rows of the periodic table are called _____. a. | clusters | b. | families | c. | groups | d. | periods | e. | quarks | | |
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25.
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Atoms
of the same element with different numbers of neutrons are called _____. a. | isotopes | b. | metals | c. | metalloids | d. | radioactive | e. | transition
elements | | |
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26.
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A
particle that moves around the nucleus is _____. a. | an electron | b. | an
ion | c. | a
neutron | d. | a quark | e. | a
proton | | |
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27.
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Elements in Groups 3 through 12 of the periodic table are called
_____. a. | isotopes | b. | metalloids | c. | metals | d. | noble gases | e. | transition
elements | | |
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28.
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A
_____ is used to accelerate protons in the study of subatomic particles. a. | teratron | c. | technology | b. | temanite | d. | television | | | | |
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29.
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A
certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is
_____.
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