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 contain more electrons than neutrons?
a. | I
only | c. | I and II
only | b. | II
only | d. | II and III
only | | | | |
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2.
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The
atom with the same number of neutrons as 54Cr is a. | 50Ti | c. | 53Fe | b. | 51V | d. | 55Mn | | | | |
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3.
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All
isotopes of tin (Sn) have the same
I. number of protons
II. number of
neutrons
III. mass number a. | I only | c. | III only | b. | II
only | d. | I and III
only | | | | |
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4.
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Which
one of the following sets repersents a pair of isotopes? a. |  C and  N | c. |  S and  S2- | b. | O2 and O3 | d. |  Pb and
 Pb | | | | |
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5.
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The
atomic and mass numbers for four different nuclei are given in the table below. Which two are
isotopes?
atomic number
mass number
I.
101
256
II.
102
258
III.
102
260
IV.
103
259 a. | I and II
| c. | II and
IV | b. | II and
III | d. | III and
IV | | | | |
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6.
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Which
specis contains 16 protons, 17 neutrons and 18 electrons? a. | 32S- | c. | 34S- | b. | 33S2- | d. | 35S2- | | | | |
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7.
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Spectra have been used to study the arrangements of electrongs in atoms. An emission
spectrum consists of a series of bright lines that converge at high frequencies. Such emissions
spectra provide evidence that electrons are moving from a. | lower to higher
energy levels with the higher energy levels being closer together | c. | higher to loswer energy levels with lower energy levels being
closer together | b. | lower to higher energy levels with the lower energy levels
being closer together | d. | higher to loswer
energy levels with the higher energy levels being closer together | | | | |
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8.
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Which
electron transition in a hydrogen atom releases the most energy? a. | n = 2 ---> n
= 1 | c. | n = 6 ----> n
= 3 | b. | n = 4 ---> n
= 2 | d. | n = 7 ----> n
= 6 | | | | |
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9.
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An
element has the electronic configuration 2.7. What would be the electronic configuration of an
element with similar chemical properties?
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10.
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An
element with the symbol Z has the electron configuration 2.8.6. Which species is this element
most likely to form? a. | The ion Z2+ | c. | The compound H2Z | b. | The ion
Z6+ | d. | The compound
Z6F | | | | |
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11.
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The
element rubidium (atomic mass 85.47) consists of two isotopes, one of mass
number 85 (Rb-85) and the other of mass number 87 (Rb-87). Which
one of the following statements about the isotopes of rubidium is correct?
a. | Rb-85 is
approximately twice as abundant as Rb-87.
| c. | Rb-87 is approximately twice as abundant as
Rb-85. | b. | Rb-85 is approximately three times as abundant as
Rb-87.
| d. | Rb-87 is
approximately three times as abundant as Rb-85.
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12.
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How
many protons, neutrons and electrons are present in the ion,
2411Na+?
a. | 11p, 13n, 12e | c. | 12p, 12n, 11e | b. | 11p, 13n,
10e
| d. | 11p, 24n,
10e | | | | |
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13.
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How
many valence (outer shell) electrons are present in the element with atomic
number 15?
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14.
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Which
combination best describes the distribution of mass, positive charge and negative charge in an atom,
according to current atomic theory?
a. | Mass=evenly throughout
Positive
charge=evenly throughout Negative charge=evenly throughout
| c. | Mass=concentrated at centre
Positive charge=concentrated at centre
Negative charge=mainly away from the centre
| b. | Mass=Concentrated at centre Positive
charge=evenly throughout Negative charge=mainly away from the
centre
| d. | Mass=concentrated at
centre
Positive
charge=concentrated at centre Negative charge=concentrated at
centre | | | | |
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15.
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How
many protons and neutrons are present in an atom of the species
6329Cu?
a. | 29p 34n
| c. | 34p
29n | b. | 29p 63n | d. | 63p 29n | | | | |
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16.
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How many valence electrons (electrons in the outermost
shell) are present in the element of atomic number
14?
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17.
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A particular element consists of two
isotopes: 72% of mass number 85 and 28% of mass number 87. The atomic weight of this
element is expected to be
a. | less than 85. | c. | between 86 and 87. | b. | between 85 and
86 | d. | more than
87. | | | | |
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18.
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Which option below contains a pair of
isotopes?
a. | 32He and
42He | c. | 3115P and 3216S | b. | 189O and
189F | d. | Diamond and
graphite | | | | |
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19.
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Naturally occurring chlorine consists of the isotopes Cl-35 and Cl-37. The
relative atomic mass of chlorine is 35.5. Which one of the following statements is
true?
a. | The Cl-35 and
Cl-37 atoms are equal in number. | c. | There are three times as many Cl-35 atoms as Cl-37
atoms. | b. | There are twice as many Cl-37 atoms as Cl-35
atoms. | d. | The ratio of
(Cl-35/ Cl-37) atoms is (35/37). | | | | |
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20.
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Which
one of the following species would be deflected by an electric field?
I-electron
II-proton III-neutron
a. | I
only | c. | I and II
only | b. | III
only | d. | I, II, and
III | | | | |
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21.
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Which electronic transition requires the greatest energy?
a. | n = 1
® n =
2 | c. | n = 3 ® n = 5 | b. | n = 2
® n =
3 | d. | n = 5
® n =
6 | | | | |
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22.
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A
certain element has an atomic mass of 106.42 g mol-1. The fact that this mass is not
a whole number indicates that a. | the elements is radioactive.
| c. | its atomic mass
includes the mass of the protons and neutrons but not the electrons. | b. | The element is
impure. | d. | The element
contains more than one isotope. | | | | |
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23.
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Two
neutral atoms are represented by the symbols 5927Co and
5928Ni. What is the difference between
these two atoms?
a. | The number of neutrons only | c. | The number of protons and neutrons
only | b. | The number of
protons and electrons only | d. | The number of
protons, neutrons and electrons | | | | |
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24.
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Which
two species contain the same number of electrons?
a. | Na and
K | c. | Cl+
and Ar | b. | F- and Ne | d. | Fe3+ and Co2+ | | | | |
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25.
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Which one of the following species contains more electrons than
neutrons? a. | 2412Mg2+
| c. | 7533As | b. |
2713Al | d. | 3216S2- | | | | |
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26.
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A
sample of the imaginary element X consists of 20% 12X and 80% 13X.
The relative atomic mass of X is
a. | 12.2 | c. | 12.8 | b. | 12.5 | d. | 13.0 | | | | |
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27.
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If an
electron shifts from one energy level in an atom to a lower level, energy is emitted. Which one of
the following electron transitions would release the most energy?
a. | Second level to
first level | c. | Third level to
first level | b. | Third level to second level | d. | First level to fourth level | | | | |
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28.
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An
atom of strontium-90 (9038Sr) contains
a. | 38 electrons, 38
protons, 52 neutrons | c. | 52 electrons,
52 protons, 38 neutrons | b. | 38 electrons, 38 protons, 90
neutrons | d. | 52 electrons, 38
protons, 38 neutrons | | | | |
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29.
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A
certain element is listed as having an atomic mass of 72.6 units. It is probably true that it
contains a. | a mixture of
isomers. | c. | a mixture
of isotopes. | b. | a mixture of allotropes. | d. | an impurity. | | | | |
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30.
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Which
of the following pairs of species would have the greatest similarities in chemical
properties? a. | 39K
and 39K+ | c. | 39K
and 40K | b. | 39K and 23Na
| d. | 40K
and 40Ca | | | | |
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31.
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The
nucleus of a radon atom, 22286Rn,
contains
a. | 222 protons and
86 neutrons. | c. | 86 protons and
222 neutrons. | b. | 86 protons and 136 neutrons. | d. | 86 protons, 136 neutrons and 86
electrons.
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32.
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The
species 10444Ru contains a. | 44
neutrons and 44 electrons. | c. | 44 protons and 104 neutrons. | b. | 44 protons and
44 electrons. | d. | 60
neutrons and 60 electrons. | | | | |
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