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Chemistry Ch.4 Test Review
Test Description: Review for Ch.4
Instructions: Answer all questions to get your test result.
1) The smallest particle of an element that retains the properties of that element is a(n)
A
proton
B
electron
C
atom
D
neutron
2) Atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom are called ________________.
A
atomic number
B
mass number
C
ions
D
isotopes
3) The total number of protons and neutrons in the nucleus of an atom is called the ___________________
A
atomic mass unit
B
atomic number
C
mass number
D
atomic mass
4) All atoms are _______________.
A
negatively charged, with the number of electrons exceeding the number of protons
B
neutral, with the number of protons equaling the number of electrons
C
neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons
D
positively charged, with the number of protons exceeding the number of electrons
5) The atomic number of an element is the total number of which particles in the nucleus
A
protons and electrons
B
electrons
C
neutrons
D
protons
6) What does the number 128 in the name Iodine-128 represent?
A
the sum of the protons and electrons
B
the mass number
C
the atomic number
D
twice the number of protons
7) All atoms of the same element have the same _________.
A
number of neutrons
B
number of protons
C
number of electrons
D
atomic number
8) How many protons, electrons, and neutrons does an atom with atomic number 55 and mass number 130 contain?
A
55 protons, 55 electrons, 75 neutrons
B
125 neutrons, 55 protons, 75 electrons
C
75 electrons, 55 protons, 55 neutrons
D
70 neutrons, 75 protons, 55 electrons
9) How is the number of neutrons in the nucleus of an atom calculated?
A
Add the mass number to the number of electrons.
B
Subtract the number of protons from the mass number.
C
Subtract the number of electrons from the number of protons.
D
Add the number of electrons and protons together.
10) What unit is used to measure weighted average atomic mass?
A
nanogram
B
gram
C
amu
D
angstrom
11) The atomic mass of an element is the _________.
A
total number of subatomic particles in its nucleus
B
average of the mass number and the atomic number for the element
C
total mass of the isotopes of the element
D
weighted average of the masses of the isotopes of the element
12) Which of the following is necessary to calculate the atomic mass of an element?
A
the atomic mass of carbon-12
B
the relative masses of the element's protons and neutrons
C
the masses of each isotope of the element
D
the atomic number of the element
13) How many protons are present in an atom of F-19?
A
19
B
9
C
none of the above
D
10
14) How many electrons does an atom of tellurium have?
A
76
B
none of the above
C
128
D
52
15) How many neutrons does an atom of Cu-64 have?
A
35
B
29
C
none of the above
D
64
16) What is the mass number for a sulfur atom that has 18 neutrons in its nucleus?
A
34
B
16
C
none of the above
D
18
17) What is the atomic number for an element with 38 neutrons and a mass number of 78?
A
40
B
none of the above
C
38
D
78
18) The range in size of most atomic radii is approximately _________.
A
5 x 10^-11 m to 2 x 10^-10 m
B
5 x 10^-21 m to 2 x 10^-20 m
C
2 to 5 cm
D
2 to 5 nm
19) Which of the following is NOT a part of Dalton's atomic theory?
A
Atoms that combine do so in simple whole number ratios.
B
Atoms are always in motion.
C
Atoms of the same element are identical.
D
All elements are composed of atoms.
20) Which of the following is true about subatomic particles?
A
The mass of a neutron nearly equals the mass of a proton.
B
Neutrons have no charge and are the lightest subatomic particle.
C
Protons are positively charged and the lightest subatomic particle.
D
Electrons are negatively charged and are the heaviest subatomic particle.
*select an answer for all questions
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