Download 1. The atomic number of an atom is always equal to the total number

1.
The atomic number of an atom is always equal to
the total number of
A.
neutrons in the nucleus
B.
protons in the nucleus
C.
neutrons plus protons in the atom
2.
All of the atoms of argon have the same
A.
mass number
B.
atomic number
C.
number of neutrons
D. number of nucleons
D. protons plus electrons in the atom
3.
An atom of an element contains 20 protons,
20 neutrons, and 20 electrons. This element is
A.
an alkali metal
B.
an alkaline earth metal
C.
a halogen
D. a noble gas
4.
What is the atomic number of an element whose
atoms each contain 47 protons, 60 neutrons, and
47 electrons?
A.
13
B.
47
C.
60
D. 107
5.
The atomic number of an alkali metal is
A.
7.
1
B.
11
C.
14
6.
D. 20
Which atom has a nucleus that contains 13 protons
and 14 neutrons?
A.
Mg
B.
Be
C.
Al
D. N
8.
The properties of elements are periodic functions of
their
A.
mass numbers
B.
atomic masses
C.
atomic radii
D. atomic numbers
The atomic number of any atom is equal to the
number of
A.
neutrons in the atom only
B.
protons in the atom, only
C.
neutrons plus protons in the atom
D. protons plus electrons in the atom
9.
A particle of matter contains 6 protons, 7 neutrons,
and 6 electrons. This particle must be a
A.
neutral carbon atom
B.
neutral nitrogen atom
C.
positively charged carbon ion
10.
What is the total number of protons and neutrons in
the nuclide 80
Br?
35
A.
35
B.
45
C.
80
D. 115
D. positively charged nitrogen ion
11.
As the number of neutrons in the nucleus of a given
atom of an element increases, the atomic number of
that element
A.
decreases
C.
remains the same
B.
increases
12.
What is the atomic number of an element that has
six protons and eight neutrons?
A.
6
B.
2
C.
8
D. 14
13.
15.
The elements in the Periodic Table are arranged in
order of increasing
A.
atomic number
B.
C.
mass number
D. neutron number
14.
atomic radius
Which quantity identi es an element?
A.
atomic number
B.
mass number
C.
total number of neutrons in an atom of the
element
D. total number of valence electrons in an atom of
the element
Which notation represents an atom of sodium with
an atomic number of 11 and a mass number of 24?
A.
16.
24 Na
11
B.
11 Na
24
C.
13 Na
11
D.
35 Na
11
The diagram below represents the nucleus of an
atom.
What are the atomic number and mass number of
this atom?
A.
The atomic number is 9 and the mass number
is 19.
B.
The atomic number is 9 and the mass number
is 20.
C.
The atomic number is 11 and the mass number
is 19.
D. The atomic number is 11 and the mass number
17.
Each diagram below represents the nucleus of a
di erent atom.
18.
Which diagrams represent nuclei of the same
element?
19.
A.
D and E, only
B.
C.
Q and R, only
D. Q, R, and E
neutrons, only
B.
protons, only
C.
neutrons plus protons
D. electrons plus protons
A.
neutron and electron
B.
neutron an deutron
C.
proton and neutron
D. proton and electron
D, E, and Q
The mass number of an atom is equal to the number
of
A.
Which two particles have approximately the same
mass?
20.
An atom of
226 Rn
88
contains
A.
88 protons and 138 neutrons
B.
88 protons and 138 electrons
C.
88 electrons and 226 neutrons
D. 88 electrons and 226 protons
21.
If the nucleus of an atom is represented as
atom is
A.
Na
B.
Al
C.
Mg
24 X,
11
the
22.
D. Br
The nucleus is the part of the atom that
A.
consist mostly of empty space
B.
has a negative charge
C.
occupies most of the atom's total volume
D. contains most of the atom's total mass
23.
The total number of protons and neutrons in the
nuclide 37
Cl is
17
A.
54
B.
37
C.
20
D. 17
24.
What is the mass number of an atom which contains
21 electrons, 21 protons, and 24 neutrons?
A.
21
B.
42
C.
45
D. 66
25.
What is the mass number of an ion that has
83 protons, 80 electrons, and 126 neutrons?
A.
27.
83
B.
206
The nucleus of an atom of
C.
209
127 I
53
contains
A.
53 neutrons and 127 protons
B.
53 protons and 127 neutrons
C.
53 protons and 74 neutrons
D. 53 protons and 74 electrons
26.
D. 289
Which atom is used as the standard for determining
the relative masses of all other elements?
A.
28.
24 Mg
B.
16 O
C.
12 C
D.
1H
An atom that contains 8 protons, 8 electrons, and
9 neutrons has
A.
an atomic number of 9
B.
an atomic number of 16
C.
a mass number of 17
D. a mass number of 25
29.
One atomic mass unit (1 amu) is equal to the mass
of a carbon-12 atom multiplied by the quantity
A.
12
B.
1
12
C.
1836
D.
30.
1
1836
Compared to the entire atom, the nucleus of the
atom is
A.
smaller and contains most of the atom's mass
B.
smaller and contains little of the atom's mass
C.
larger and contains most of the atom's mass
D. larger and contains little of the atom's mass
31.
What is the mass number of an atom which contains
28 protons, 28 electrons, and 34 neutrons?
A.
28
B.
56
C.
62
D. 90
32.
The mass number of an atom is always equal to the
total number of its
A.
electrons, only
B.
protons, only
C.
electrons plus protons
D. protons plus neutrons
33.
The major portion of an atom's mass consists of
A.
electrons and protons
B.
electrons and neutrons
C.
neutrons and positrons
34.
What is the mass number of an atom that contains
19 protons, 19 electrons, and 20 neutrons?
A.
19
B.
20
C.
39
D. 58
D. neutrons and protons
35.
The atomic mass of an element is de ned as the
weighted average mass of that element's
A.
most abundant isotope
B.
least abundant isotope
C.
naturally occurring isotopes
D. radioactive isotopes
36.
What is the total number of protons and neutrons in
an atom of 86
Rb?
37
A.
37
B.
49
C.
86
D. 123
37.
The atomic mass unit is de ned as exactly
mass of an atom of
A.
39.
12 C
6
B.
14 C
6
C.
24 Mg
12
1
12
D.
the
38.
26 Mg
12
An atom of carbon-12 and an atom of carbon-14
di er in
A.
atomic number
B.
mass number
C.
nuclear charge
D. number of electrons
40.
In which list are the elements arranged in order of
increasing atomic mass?
A.
Cl, K, Ar
B.
Fe, Co, Ni
C.
Te, I, Xe
D. Ne, F, Na
The atomic mass of an element is calculated using
the
A.
atomic number and the ratios of its naturally
occurring isotopes
B.
atomic number and the half-lives of each of its
isotopes
C.
masses and the ratios of its naturally occurring
isotopes
D. masses and the half-lives of each of its isotopes
41.
43.
Compared to an atom of phosphorus-31, an atom of
sulfur-32 contains
A.
one less neutron
B.
one less proton
C.
one more neutron
D. one more proton
Which diagram represents the nucleus of an atom of
27 Al ?
13
A.
B.
C.
D.
42.
What is the mass number of an atom that has six
protons, six electrons, and eight neutrons?
A.
6
B.
12
C.
14
D. 20
44. Which isotopic notation represents an atom of
carbon-14?
A.
6C
8
B.
8C
6
C.
6C
14
D.
14 C
6
45.
47.
Which isotopic notation identi es a metalloid that is
matched with the corresponding number of protons
in each of its atoms?
A.
24 Mg
B.
28 Si
C.
75 As
and 75 protons
D.
80 Br
and 80 protons
and 12 protons
6
The most common isotope of chromium has a mass
number of 52. Which notation represents a di erent
isotope of chromium?
52 Cr
24
54 Cr
24
D.
24 Cr
54
The number of protons in the nucleus of
32 P
15
is
A.
D. 47
A.
B.
C.
24 Cr
52
and 14 protons
What is the mass number of a carbon atom that
contains six protons, eight neutrons, and six
electrons?
A.
46.
B.
8
C.
14
D. 20
48.
15
B.
17
C.
32
49.
How many protons are present in an atom of
A.
51.
15
B.
16
C.
31
31 P?
15
protons
B.
neutrons
C.
occupied sublevels
D. occupied principal energy levels
The number of protons in an atom of 31 H is
A.
D. 46
Compared to an atom of calcium-40, an atom of
potassium-39 contains fewer
A.
50.
52.
1
B.
2
C.
3
D. 4
Which atom contains exactly 15 protons?
A.
phosphorus-32
B.
sulfur-32
C.
oxygen-15
D. nitrogen-15
53.
An atom of
of
40 Ar
18
has a nucleus that contains a total
A.
18 electrons
B.
C.
18 neutrons
D. 18 nucleons
54.
18 protons
The mass of a calcium atom is due primarily to the
mass of its
A.
protons, only
B.
neutrons, only
C.
protons and neutrons
D. protons and electrons
55.
What is the total number of protons contained in the
nucleus of a carbon-14 atom?
A.
6
B.
8
C.
12
D. 14
56.
Which subatomic particles have a mass of
approximately 1 atomic mass unit each?
A.
proton and electron
B.
proton and neutron
C.
neutron and positron
D. electron and positron
57.
What is the charge and mass of a proton?
A.
charge of +1 and mass of 1 amu
B.
charge of +1 and mass of
C.
charge of
D. charge of
59.
1
1836
58.
An atom contains 22 neutrons and 40 nucleons.
What is the total number of protons in the atom?
A.
amu
18
B.
22
C.
40
D. 62
1 and mass of 1 amu
1 and mass of
1
1836
amu
What is the structure of a krypton-85 atom?
60.
Subatomic particles can usually pass unde ected
through an atom because the volume of an atom is
composed of
A.
49 electrons, 49 protons, and 85 neutrons
B.
49 electrons, 49 protons, and 49 neutrons
A.
an uncharged nucleus
C.
36 electrons, 36 protons, and 85 neutrons
B.
largely empty space
D. 36 electrons, 36 protons, and 49 neutrons
C.
neutrons
D. protons
61.
What is the total number of protons in the nucleus
of an atom of potassium 42?
A.
15
B.
19
C.
39
D. 42
62.
Which statement is true about the charges assigned
to an electron and a proton?
A.
Both an electron and a proton are positive.
B.
An electron is positive and a proton is negative.
C.
An electron is negative and a proton is positive.
D. Both an electron and a proton are negative.
63.
Which of these phrases best describes an atom?
64. Which statement is true about a proton and an
electron?
A.
a positive nucleus surrounded by a hard
negative shell
A.
B.
a positive nucleus surrounded by a cloud of
negative charges
They have the same masses and the same
charges.
B.
C.
a hard sphere with positive particles uniformly
embedded
They have the same masses and di erent
charges.
C.
They have di erent masses and the same
charges.
D. a hard sphere with negative particles uniformly
embedded
D. They have di erent masses and di erent
charges.
65.
A student constructs a model for comparing the
masses of subatomic particles. The student selects
a small, metal sphere with a mass of 1 gram to
represent an electron. A sphere with which mass
would be most appropriate to represent a proton?
A.
1g
B.
1
2
g
C.
1
2000
g
66.
D. 2000 g
The total mass of the protons in an atom of
gold-198 is approximately
A.
79 atomic mass units
B.
119 atomic mass units
C.
198 atomic mass units
D. 277 atomic mass units
67.
An atom is electrically neutral because the
A.
number of protons equals the number of
electrons
B.
number of protons equals the number of
neutrons
C.
ratio of the number of neutrons to the number
of electrons is 1 : 1
D. ratio of the number of neutrons to the number
of protons is 2 : 1
68.
The mass of 12 protons is approximately equal to
A.
1 atomic mass unit
B.
12 atomic mass units
C.
the mass of 1 electron
D. the mass of 12 electrons
69.
A proton has a charge that is opposite the charge of
A.
an alpha particle
B.
C.
an electron
D. a positron
70.
a neutron
Which subatomic particles are located in the nucleus
of a neon atom?
A.
electrons and positrons
B.
electrons and neutrons
C.
protons and neutrons
D. protons and electrons
71.
Which two particles each have a mass approximately
equal to one atomic mass unit?
A.
electron and neutron
B.
electron and positron
C.
proton and electron
D. proton and neutron
72.
Which two particles have opposite charges?
A.
an electron and a neutron
B.
an electron and a proton
C.
a proton and a neutron
D. a proton and a positron
73.
Which statement compares the masses of two
subatomic particles?
A.
The mass of an electron is greater than the
mass of a proton.
B.
The mass of an electron is greater than the
mass of a neutron.
C.
The mass of a proton is greater than the mass
of an electron.
74.
Which nucleus contains the greatest number of
neutrons?
A.
31 S
16
B.
32 S
16
C.
31 P
15
D.
32 P
15
D. The mass of a proton is greater than the mass
of a neutron.
75.
In which pair of atoms do both nuclei contain the
same number of neutrons?
and 94 Be
A.
7 Li
3
C.
40 Ca
20
and
38 Ar
18
B.
40 K
19
and
40 Cl
17
D.
14 N
7
and
16 O
8
76.
Which nucleus is from an isotope of an atom with
6n
the nucleus 6p ?
_
A.
C.
6n
6p *YT*
B.
8n
6p *YT*
D.
_
_
4n
8p *YT*
_
_
6n
8p *YT*
77.
What is the total number of neutrons in an atom of
7 Li?
3
A.
7
B.
10
C.
3
78.
D. 4
What are the characteristics of a neutron?
A.
It has no charge and no mass.
B.
It has no charge and a mass of 1 amu.
C.
It has a charge of +1 and no mass.
D. It has a charge of +1 and a mass of 1 amu.
79.
What is the total number of neutrons in an atom of
an element that has a mass number of 19 and an
atomic number of 9?
A.
9
B.
10
C.
19
D. 28
80.
A Ca2+ ion di ers from a Ca0 atom in that the
Ca2+ ion has
A.
more protons
B.
fewer protons
C.
more electrons
D. fewer electrons