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5209 - 1 - Page 1
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1)
The development of the cathode ray tube led to the discovery of what subatomic particle?
A) neutron
2)
B) Bohr
Different atoms combine in simple whole-number ratios to form compounds.
During a chemical reaction, atoms cannot be separated, combined, or rearranged.
Atoms can be created or destroyed.
All atoms of a given element are not identical.
In the early 1900's, it was proposed that energy may be absorbed or released from atoms in small, indivisible packets named
B) nucleons
C) Planetary model
D) Wave-mechanical model
B) a photon
B) protons
B) protons
B) orbital
C) has a negative charge
D) has no charge
C) electrons
D) empty space
C) quantum
D) spectrum
C) neutron
D) beta
What particle has approximately the same mass as a proton?
A) electron
16)
D) deuterons
What term refers to the region of an atom where an electron is most likely to be found?
A) orbit
15)
C) neutrons
After bombarding a gold foil sheet with alpha particles, scientists concluded that atoms consist mainly of
A) neutrons
14)
D) a nucleus
Experimental evidence indicates that the nucleus of an atom
A) contains a small percentage of the mass of the atom
B) contains most of the mass of the atom
13)
C) an orbital
When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates
that most of the volume of a gold atom consists of
A) unoccupied space
12)
D) protons
A region of most probable electron location in an atom is called
A) a nucleon
11)
C) orbitals
What model of the atom proposes that electrons are located in orbitals?
A) "Plum pudding" model
B) Hard-particle model
10)
C) have similar physical properties
D) are in continual motion
Which of the following statements is a part of Dalton's atomic theory?
A) quanta
9)
C) smaller and contains little of the atom's mass
D) smaller and contains most of the atom's mass
In ancient Greece, it was proposed that matter is composed of earth, air, water, and fire, and that these elements
A)
B)
C)
D)
8)
C) smaller than the atom and negatively charged
D) larger than the atom and positively charged
C) neither particles nor waves
D) waves only
A) have similar chemical properties
B) are stationary
7)
D) Rutherford
Electrons have the properties of
A) particles only
B) particles and waves
6)
C) Dalton
Compared to the entire atom, the nucleus of the atom is
A) larger and contains little of the atom's mass
B) larger and contains most of the atom's mass
5)
D) positron
In an experiment, alpha particles were used to bombard gold foil. As a result of this experiment, the conclusion was made that the
nucleus of an atom is
A) larger than the atom and negatively charged
B) smaller than the atom and positively charged
4)
C) electron
What Greek philosopher was the first person to propose the idea that matter is made of tiny individual particles called atoms?
A) Democritus
3)
B) proton
B) alpha
Which of the following statements best describes an electron?
A)
B)
C)
D)
It has
It has
It has
It has
a greater mass than a proton and a negative charge.
a smaller mass than a proton and a negative charge.
a greater mass than a proton and a positive charge.
a smaller mass than a proton and a positive charge.
5209 - 1 - Page 2
17)
What is the approximate mass of an electron?
A) 1 atomic mass unit
18)
The mass of an electron is approximately
A)
19)
3
H
1
0
H
1
C)
4
He
2
D)
2
H
1
B)
0
H
0
C)
1
H
0
D)
1
H
1
B) a neutron
C) protons and neutrons
D) neutrons and electrons
B) 2.0 g
B) 2
B) a positron
the mass of a proton?
C) an electron
D) an alpha particle
B) an electron
C) a neutron
D) a beta particle
C) protons and neutrons
D) protons and electrons
B) alpha particle
C) proton
D) beta particle
What particle will be attracted to the positive electrode in an electric field?
B) an alpha particle
C) a positron
D) a neutron
C) positron
D) proton
What particle is electrically neutral?
B) neutron
What kind of radiation will travel through an electric field on a pathway that remains unaffected by the field?
A) a gamma ray
33)
D) 4
Which particle has a negative charge?
A) electron
32)
C) 5
What are the nucleons in an atom?
A) a beta particle
31)
D) 1.7 x 10-24 g
What kind of particle, when passed through an electric field, would be attracted to the negative electrode?
A) neutron
30)
D) a proton
C) 10 g
What particle has a negative charge and a mass that is approximately
A) neutrons and electrons
B) neutrons and positrons
29)
C) a neutron
How many protons are in the nucleus of an atom of beryllium?
A) an alpha particle
28)
B) a beta particle
A particle has a mass of 1.0 atomic mass unit. What is the approximate mass of this particle in grams?
A) a neutron
27)
C) proton and electron
D) neutron and deuteron
What particle has a mass of approximately one atomic mass unit and a unit positive charge?
A) 9
26)
D) a deuteron
Which two particles have approximately the same mass?
A) 6.0 x 10-23 g
25)
C) an electron
What two particles account for most of the mass in the atom?
A) an alpha particle
24)
of a proton
1
H
1
A) proton and neutron
B) neutron and electron
23)
D)
times the mass of
A) protons and electrons
B) neutrons and positrons
22)
of a proton
Which particle has the least mass?
A) a proton
21)
B)
C)
Which symbol represents a proton?
A)
20)
of a C-12 atom
B)
B) an electron
C) an alpha particle
D) a proton
What is the number of protons present in the nucleus of the atom below?
59
Co
27
A) 32
B) 27
C) 86
D) 59
5209 - 1 - Page 3
34)
What is the number of protons in the nucleus of the atom below?
32
P
15
A) 47
35)
42
Ti
22
B) 14
B)
40
Ti
22
B) 17
B) 18
B) oxygen-15
B) Ar
12
C
6
B)
2
H
1
B) ethane
D) 35
C) sulfur-32
D) nitrogen-15
C) Al
D) Na
C)
14
N
7
D)
4
He
2
C) ethene
D) magnesium
C) number of neutrons
D) mass number
A particle of matter contains 6 protons, 7 neutrons, and 6 electrons. This particle must be a
C) neutral nitrogen atom
D) positively charged carbon ion
The atomic number of an atom is always equal to the total number of
C) neutrons plus protons in the atom
D) neutrons in the nucleus
All atoms of an element have the same
A) number of neutrons
B) number of nucleons
50)
C) 36
All of the atoms of argon have the same
A) protons plus electrons in the atom
B) protons in the nucleus
49)
D) 9
Which substance is composed of atoms that all have the same atomic number?
A) neutral carbon atom
B) positively charged nitrogen ion
48)
C) 1
C) number of protons
D) mass number
A) numbers of nucleons
B) atomic number
47)
40
Ca
20
Which atom has the greatest nuclear charge?
A) methane
46)
D)
Which atom has the greatest nuclear charge?
A)
45)
42
Ca
20
Which atom contains exactly 15 protons?
A) Si
44)
C)
Two atoms will always have the same atomic number if they have the same
A) phosphorus-32
43)
D) 2
C) nucleons and electrons
D) nucleons and neutrons
A) number of nucleons
B) number of neutrons
42)
C) 6
All atoms in a given sample of an element contain the same number of
A) protons and neutrons
B) protons and electrons
41)
D) 11
What is the total number of protons in an atom of 36 Cl?
A) 17
40)
C) 5
The total number of protons found in an OH- ion is
A) 8
39)
B) 8
What is the symbol for an atom containing 20 protons and 22 neutrons?
A)
38)
D) 15
The nucleus of an atom consists of 8 protons and 6 neutrons. The total number of electrons present in a neutral atom of this
element is
A) 8
37)
C) 32
An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of
A) 6
36)
B) 17
C) atomic mass
D) atomic number
What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11?
A) 34+
B) 12+
C) 11+
D) 23+
5209 - 1 - Page 4
51)
A sodium atom and a sodium ion must have the same number of
A) outermost electrons
B) neutrons
52)
C) protons
D) occupied principal energy levels
As an Na atom forms an Na+ ion, the number of protons in its nucleus
A) decreases
53)
B) electron
D) protons
the same atomic number and the same number of protons
a different atomic number and a different number of protons
a different atomic number, but the same number of protons
the same atomic number, but a different number of protons
As the number of neutrons in the nucleus of an atom increases, the nuclear charge of the atom
A) decreases
56)
C) neutrons
In a sample of pure copper, all atoms have
A)
B)
C)
D)
55)
C) increases
The atoms in a sample of an element must contain nuclei with the same number of
A) nucleons
54)
B) remains the same
B) increases
C) remains the same
The nucleus of which atom is represented below?
24
X
11
A) Al
57)
B) Mg
61)
7
9
Li and Be
3
4
B)
40
38
Ca and
Ar
20
18
C)
14
16
N and
O
7
8
the mass of a 16 O atom
C)
the mass of a 12 C atom
B)
the mass of a 16 O atom
D)
the mass of a 12 C atom
D)
40
40
K and
Cl
19
17
D)
2
4
H and He
1
2
Which pair of atoms contain the same number of neutrons?
3
4
H and He
1
2
B)
1
3
H and He
1
2
C)
3
3
H and He
1
2
If 50.0% of the isotopes of an element have a mass of 196 amu and 50.0% of the isotopes have a mass of 198 amu, what is the
average atomic mass of the element?
B) 196 amu
C) 98.5 amu
D) 197 amu
The major portion of an atom's mass consists of
A) neutrons and positrons
B) neutrons and protons
64)
D) 35
A)
A) 198 amu
63)
C) 37
An atomic mass unit is defined as exactly
A)
62)
B) 38
In which pair of atoms do both nuclei contain the same number of neutrons?
A)
60)
C) a homogeneous mixture
D) a heterogeneous mixture
A sample of element X contains 90. percent 35 X atoms, 8.0 percent 37 X atoms, and 2.0 percent 38 X atoms. The average isotopic
mass is closest to
A) 32
59)
D) Na
A substance that is composed only of atoms having the same atomic number is classified as
A) an element
B) a compound
58)
C) Br
C) electrons and protons
D) electrons and neutrons
The average isotopic mass of chlorine is 35.5. Which mixture of isotopes (shown as percents) produces this average mass?
A) 75% 35 Cl and 25% 37 Cl
C) 75% 12 C and 25% 13 C
B) 50% 35 Cl and 50% 37 Cl
D) 50% 12 C and 50% 13 C
5209 - 1 - Page 5
65)
What is the mass number of a tritium atom?
A) 1
66)
B) 2
C) 3
D) 4
How many particles are contained in the nucleus of the following atom?
226
Rn
88
A) 88 protons and 138 electrons
B) 88 electrons and 226 protons
67)
C) 88 protons and 138 neutrons
D) 88 electrons and 226 neutrons
How are the nuclides below similar?
14
14
C and
N
6
7
A) They both have the same nuclear charge.
B) They both have the same mass number.
68)
Element X has two isotopes. If 72.0% of the element has an isotopic mass of 84.9 atomic mass units, and 28.0% of the element has
an isotopic mass of 87.0 atomic mass units, the average atomic mass of element X is numerically equal to
C) (72.0 x 84.9) + (28.0 x 87.0)
+
A)
B) (72.0 + 84.9) x (28.0 + 87.0)
69)
C) They both have the same atomic number.
D) They both have the same number of neutrons.
D) (72.0 - 84.9) x (28.0 + 87.0)
What is the total number of protons and neutrons in the nuclide below?
37
Cl
17
A) 54
70)
B) 35.0 amu
C) 36.0 amu
D) 37.0 amu
the masses of the individual isotopes, only
the relative abundances of the isotopes, only
both the masses and the relative abundances of the individual isotopes
neither the masses nor the relative abundances of the individual isotopes
The atomic mass of an element is defined as the weighted average mass of that element's
A) least abundant isotope
B) naturally occurring isotopes
73)
D) 17
An element occurs as a mixture of isotopes. The atomic mass of the element is based upon
A)
B)
C)
D)
72)
C) 20
If 75.0% of the isotopes of an element have a mass of 35.0 amu and 25.0% of the isotopes have a mass of 37.0 amu, what is the
atomic mass of the element?
A) 35.5 amu
71)
B) 37
C) radioactive isotopes
D) most abundant isotope
How many protons and neutrons is the nucleus of the atom below composed of?
127
I
53
A) 53 protons and 74 electrons
B) 53 neutrons and 127 protons
74)
75)
C) 53 protons and 127 neutrons
D) 53 protons and 74 neutrons
Atomic mass is measured in atomic mass units (amu) that are based on an atom of
A) 12 C equal to 12.000 amu
C) 16 O equal to 16.000 amu
B) 32 S equal to 32.000 amu
D) 14 N equal to 14.000 amu
What is the total number of nucleons (protons and neutrons) in the atom below?
79
Se
34
A) 34
B) 113
C) 45
D) 79
5209 - 1 - Page 6
76)
The mass number of an atom is equal to the number of
A) electrons plus protons
B) neutrons plus protons
77)
What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?
A) 19
78)
C) neutrons, only
D) protons, only
B) 20
C) 58
D) 39
C) 3
D) 4
What is the mass number of the atom below?
3
H
1
A) 1
79)
B) 2
An atom of carbon-14 contains
A) 6 protons, 8 neutrons, and 6 electrons
B) 6 protons, 8 neutrons, and 8 electrons
80)
Which nuclide contains the greatest number of neutrons?
A) 41 Ca
81)
B) 6 g of C
C) 7 g of Li
D) 9 g of F
B) 24 Mg and 24 Na
C) 32 Si and 31 P
D) 15 N and 16 O
B) more neutrons
C) fewer neutrons
D) fewer protons
B) 128.3 amu
C) 127.4 amu
D) 127.0 amu
B) 13 amu
C) 16 amu
D) 15 amu
B) 66
C) 42
D) 45
B) 11
C) 23
D) 12
B) polonium
C) potassium
D) phosphorus
B) nitrogen
C) silicon
D) oxygen
C) protons
D) positrons
Neutral atoms of the same element can differ in their number of
A) electrons
94)
D) 4
A neutral atom with 6 electrons and 8 neutrons is an isotope of
A) carbon
93)
C) 3
Which element has no known stable isotope?
A) carbon
92)
B) 2
What is a possible mass number of a sodium atom?
A) 1
91)
D) 56 Fe
What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons?
A) 21
90)
C) 54 Fe
A sample of Nitrogen contains 95% 14 N atoms, 3% 15 N atoms and 2% 16 N atoms. What is the average atomic mass of this
sample?
A) 14 amu
89)
B) 52 Fe
What is the average atomic mass of element X if a sample is composed of 85% 127 X, 12% 130 X, and 3% 128 X?
A) 129.0 amu
88)
D) 56
Compared to an atom of C-12, an atom of C-14 has
A) more protons
87)
C) 62
In which pair does each atom have the same number of neutrons?
A) 32 S and 33 S
86)
B) 90
Which sample contains the same number of atoms as a gram-atomic mass of He?
A) 8 g of O
85)
D) 39 K
What is the mass number of a deuterium atom?
A) 1
84)
C) 37 Cl
The average atomic mass of iron is 55.847 amu. In a natural sample of iron, which is most likely the most abundant isotope?
A) 57 Fe
83)
B) 40 Ar
What is the mass number of an atom which contains 28 protons, 28 electrons, and 34 neutrons?
A) 28
82)
C) 8 protons, 6 neutrons, and 6 electrons
D) 6 protons, 6 neutrons, and 8 electrons
B) neutrons
Atoms of 16 O, 17 O, and 18 O have the same number of
A) neutrons, but a different number of protons
B) protons, but a different number of electrons
C) electrons, but a different number of protons
D) protons, but a different number of neutrons
5209 - 1 - Page 7
95)
Different isotopes of the same element must have a different
A) mass number
B) number of protons
96)
97)
Which pair of nuclei represent isotopes of the same element?
A)
C)
B)
D)
Which element has no stable isotopes?
A) 51 Sb
98)
1
H
1
158
159
X and
X
64
64
3
H
1
B)
158
158
X and
X
64
64
22
23
Na and
Na
11
11
14
X
7
4
H
2
D)
64
158
X and
X
158
64
D) 206 Pb
3
3
H and He
1
2
B)
C)
7
9
Li and Be
3
4
D)
14
14
C and
N
6
7
6
X
4
B)
C)
12
X
5
D)
13
X
6
B) increases
C) decreases
B) neutrons
C) positrons
D) electrons
Atoms of every isotope of calcium have the same
C) number of neutrons
D) atomic mass
There are no known stable isotopes of the element with an atomic number of
B) 38
C) 56
D) 100
Which pair must represent atoms of the same element?
A)
108)
D)
Neutral atoms of 35 Cl and 37 Cl differ with respect to their number of
A) 20
107)
158
158
X and
X
64
65
C) 233 U
A) number of nucleons
B) atomic number
106)
2
H
1
As the mass number of the isotopes of hydrogen increases, the number of protons
A) protons
105)
C)
B) 233 Pa
A) remains the same
104)
C)
Which symbol represents an isotope of carbon?
A)
103)
B)
Which pair of atoms are isotopes?
A)
102)
D) 82 Pb
Which substance has chemical properties similar to those of radioactive 235 U?
A) 235 Pa
101)
C) 27 Co
If X is the symbol of an element, which pair correctly represents isotopes of X?
A)
100)
B) 90 Th
Which of the following is the symbol for the deuterium isotope of hydrogen?
A)
99)
C) atomic number
D) number of electrons
13
14
X and
X
6
7
C)
2
4
X and X
1
2
D)
?
Which nuclei is an isotope of
A)
12
13
X and
X
6
6
B)
B)
C)
D)
14
14
X and
X
6
7
5209 - 1 - Page 8
109)
Isotopes of the same element must also have the same
A) mass number
B) number of nucleons
110)
111)
C) number of neutrons
D) atomic number
Which pair of atoms represent different isotopes of the same element?
A)
58
59
Co and
Ni
27
28
C)
12
13
C and
C
6
6
B)
39
39
Ar and
K
18
19
D)
35
35
Cl and
Cl
17
17
Which pair of atoms are isotopes of element X?
A)
226
227
X and
X
91
91
C)
227
227
X and
X
91
90
B)
226
227
X and
X
90
91
D)
226
226
X and
X
90
91