Answers
(2) D
(3) A
(4) B
(5) D
(6) C
(7) C
(8) A
(9) A
(10) D
(11) B
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
C
B
C
B
D
B
C
C
C
B
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
D
A
C
B
D
A
A
C
B
D
(32) C
(33) A
(34) B
The modern model of the atom is
based on the work of
A.) one scientist over a short period of
time
B.) one scientist over a long period of
time
C.) many scientists over a short period of
time
D.) many scientists over a long period of
time
In Rutherford's gold foil experiments, some
alpha particles were deflected from their
original paths but most passed through the foil
with no deflection. Which statement about gold
atoms is supported by these experimental
observations?
A.) Gold atoms consist mostly of empty space
B.) Gold atoms are similar to alpha particles
C.) Alpha particles and gold nuclei have
opposite charges
D.) Alpha particles are more dense than gold
atoms
The region labeled "X" in the
diagram has a charge that is:
A.) positive
B.) negative
C.) neutral
The nucleus of most atoms is made
up of:
A.) protons and electrons
B.) electrons and protons
C.) neutrons and electrons
D.) protons and neutrons
The _______________ constitute(s)
most of the volume of an atom.
A.) nucleus
B.) protons
C.) electron cloud
D.) neutrons
The charge and mass number of a
proton are:
A.) charge = 0, Mass number = 1
B.) charge = -1, Mass number = 0
C.) charge = +1, Mass number = 1
D.) charge = +1, Mass number = 0
The charge and mass number of an
electron are:
A.) charge = -1, Mass number = 0
B.) charge = +1, Mass number = 0
C.) charge = 0, Mass number = 1
D.) charge = +1, Mass number = 1
The region labeled "Y" in the
diagram has a charge that is:
A.) positive
B.) negative
C.) neutral
Most of the mass of the atom can
be found in the:
A.) charges
B.) electron cloud
C.) electrons
D.) nucleus
In which pair do the particles have
approximately the same mass?
A.) proton and electron
B.) proton and neutron
C.) neutron and electron
D.) neutron and beta particle
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
The charge and mass number of a
neutron are:
A.) charge = +1, Mass number = 0
B.) charge = 0, Mass number = 1
C.) charge = +1, Mass number = 1
D.) charge = -1, Mass number = 0
What is the total charge of the
nucleus of a nitrogen atom?
A.) -7
B.) 0
C.) +7
D.) +14
What is the atomic number of an
element that has six protons and
eight neutrons?
A.) 2
B.) 6
C.) 8
D.) 14
Compared to a proton, an electron
has
A.) a greater quantity of charge and the
same sign
B.) a greater quantity of charge and the
opposite sign
C.) the same quantity of charge and the
same sign
D.) the same quantity of charge and the
opposite sign
What is the total number of
electrons in an atom of potassium?
A.) 18
B.) 19
C.) 20
D.) 29
What is the total number of
electrons found in an atom of
sulfur?
A.) 6
B.) 8
C.) 16
D.) 32
Which two particles make up most
of the mass of an atom?
A.) electron and neutron
B.) electron and proton
C.) proton and neutron
D.) proton and positron
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
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
The mass number of an atom is
determined by:
A.) adding the neutrons and electrons
B.) adding the protons and electrons
C.) the number of protons only
D.) adding the neutrons and protons
The nucleus of an atom of cobalt58 contains
A.) 27 protons and 31 neutrons
B.) 27 protons and 32 neutrons
C.) 59 protons and 60 neutrons
D.) 60 protons and 60 neutrons
The nucleus of which atom contains
48 neutrons?
Atoms of different isotopes of the
same element differ in their total
number of
A.) protons
B.) neutrons
C.) electrons
Isotopes (such as hydrogen-1,
hydrogen-2, and hydrogen-3) are
atoms of the same element that
differ in:
A.) the number of electrons
B.) the atomic number
C.) the number of protons in the nucleus
D.) the number of neutrons in the nucleus
Which atom contains exactly 15
protons?
A.) phosphorus-32
B.) sulfur-32
C.) oxygen-15
D.) nitrogen-15
Which atoms are isotopes of the
same element?
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
Atoms of an unknown element have the
following masses and percent abundance:
90.92% of the atoms have a
mass of 19.988 amu, 0.26% of the atoms
have a mass of 20.983 amu and 8.82% of
atoms have a mass of 21.978 amu.
Calculate the average atomic mass of this
element.
A.) 20.983 amu
B.) 20.166 amu
C.) 25.567 amu
D.) 19.988 amu
The atomic number of an element
is always equal to:
A.) the number of protons plus the
number of neutrons
B.) the number of protons plus the
number of electrons
C.) the number of neutrons in the atom
D.) the number of protons in the atom
E.) the number of electrons in the atom
When you change the number of
electrons in an atom, you produce
a different
A.) isotope
B.) type of atom
C.) ion
D.) mass number
How many electrons are contained
in an Au+3 ion?
A.) 76
B.) 79
C.) 82
D.) 197
An ion with 5 protons, 6 neutrons,
and a charge of +3 has an atomic
number of
A.) 2
B.) 5
C.) 6
D.) 8
E.) 11