Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Which
of the following particles will not be deflected by charged plates? a. | γ particles | b. |
β particles | c. |
α particles | d. | protons | e. |
α and
β particles | | |
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2.
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J. J.
Thomson determined the charge to mass ratio of electrons by a. | creating a
charge on the amber by rubbing it with a cloth. | b. | deflecting
cathode rays with magnetic and electric fields. | c. | exposing
photographic plates to radioactive uranium ores. | d. | striking a
beryllium target with particles emitted from radioactive polonium. | e. | bombarding gold
foil with alpha particles. | | |
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3.
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From
the results of his gold foil experiment, Ernest Rutherford concluded that a. | electrons have a
charge of -1.602 x 10-19 C. | b. | atoms contain
equal numbers of protons and electrons. | c. | uranium ores emit a form of radiation that affect photographic
plates. | d. | alpha particles are helium nuclei. | e. | atoms are
composed of a small, dense nucleus surrounded by a cloud of electrons. | | |
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4.
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Alpha
particles (α)
are a. | identical to
electrons. | b. | high energy electromagnetic
radiation. | c. | helium nuclei. | d. | identical to
canal rays. | e. | positively charged electrons. | | |
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5.
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Beta
(β) particles are
identical to ____. a. | neutrons | b. | electrons | c. | helium nuclei | d. | light | e. | protons | | |
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6.
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Rank
the subatomic particles from lowest to highest mass. a. | electrons =
protons < neutrons | b. | electrons < neutrons < protons | c. | electrons <
protons < neutrons | d. | neutrons < electrons < protons | e. | electrons <
protons = neutrons | | |
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7.
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An
atomic mass unit (u) is defined as a. | the mass of one hydrogen-1 atom. | b. | 1/8 the mass of
one oxygen-16 atom. | c. | 1/12 the mass of one carbon-12 atom. | d. | 1.99
x
10-23 g. | e. | the sum of the masses of one proton, one neutron, and one
electron. | | |
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8.
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Which
of the following atoms contains the largest number of protons? a. | 231Pa | b. | 227Ac | c. | 232Th | d. | 226Ra | e. | 222Rn | | |
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9.
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How
many protons, neutrons, and electrons are in an oxygen-18 atom? a. | 6 protons, 8
neutrons, 4 electron | b. | 6 protons, 10 neutrons, 8 electrons | c. | 8 protons, 8
neutrons, 8 electrons | d. | 8 protons, 10 neutrons, 8 electrons | e. | 8 protons, 10
neutrons, 18 electrons | | |
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10.
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What
is the atomic symbol for an element with 28 protons and 31 neutrons?
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11.
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What
is the identity of  ?
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12.
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What
is the atomic symbol for an element that has 30 neutrons and a mass number of 55?
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13.
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How
many neutrons are in cobalt-59?
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14.
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Which
of the following atoms contains the largest number of protons? a. | 158Gd | b. | 157Tb | c. | 127I | d. | 138Ba | e. | 144Nd | | |
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15.
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Which
of the following atoms contains the largest number of neutrons?
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16.
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Which
two of the atoms below have the same number of neutrons?
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17.
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Give
the mass number of a bromine atom with 46 neutrons.
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18.
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All
of the following statements are true EXCEPT a. | for any neutral element, the number of protons and electrons
are equal. | b. | electrons and protons have equal mass, but opposite
charges. | c. | the mass number is the sum of the number of protons and
neutrons. | d. | the atomic number equals the number of
protons. | e. | isotopes of an element have identical atomic
numbers. | | |
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19.
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Bromine has two naturally occurring isotopes. The average mass of bromine is 79.904 u.
If 50.54% of bromine is found as bromine-79 (78.9183 u), what is the mass of the other
isotope? a. | 79.82
u | b. | 79.97
u | c. | 80.91
u | d. | 81.93
u | e. | 82.91
u | | |
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20.
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An
element consists of two isotopes. The abundance of one isotope is 95.72% and its atomic mass is
114.9041 u. The atomic mass of the second isotope is 112.9043 u. What is the average atomic mass of
the element? a. | 113.9
u | b. | 113.0
u | c. | 113.9
u | d. | 114.8
u | e. | 115.1
u | | |
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