Unit 2, Lesson 4 Study Guide
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Which of these particles is the smallest?
A.
B.
C.
D.
____
2. Which particle’s mass is similar to the mass of a proton?
A.
B.
C.
D.
____
an atom
a nucleus
a neutron
an electron
3. Consider a wooden chair and a balloon. What do these two objects always have in common?
A.
B.
C.
D.
____
an atom
a nucleus
a proton
an electron
Both are made of atoms.
Both have the same mass number.
Both are made of the same kind of atom.
Both are made of the same number of atoms.
4. Each element is made up of different atoms. The table below compares two elements.
Atomic number
Mass number
Element 1
10
20
Element 2
9
19
What do the elements in the table have in common?
A.
B.
C.
D.
____
Atoms in each element have 10 nuclei.
Atoms in each element have 10 protons.
Atoms in each element have 10 neutrons.
Atoms in each element have 10 electrons.
5. Every atom has a nucleus and an electron cloud. The diagram below shows a model of an atom.
Which label points to the ELECTRON CLOUD?
A.
B.
C.
D.
____
A
B
C
D
6. The diagram below shows a model of an atom.
Which label points to the nucleus?
A.
B.
C.
D.
____
A
B
C
D
7. A row of 100 million atoms of a single type would be only about 1 centimeter (cm) long. What occupies most
of this space?
A.
B.
C.
D.
water
nuclei
electrons
empty space
____
8. An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
85
A.
B. 125
C. 210
D. 295
____
9. An atom of vanadium (V) has 23 protons and 28 neutrons. How many electrons does a neutrally charged atom
of vanadium have?
A.
B.
C.
D.
5
23
28
51
____ 10. Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a
proton, which object would best represent an electron?
A.
B.
C.
D.
a pea
a bowling ball
a beach ball
a soccer ball
____ 11. An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of
lead have?
A.
B.
C.
D.
82
125
207
289
____ 12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?
A.
B.
C.
D.
4
5
9
13
____ 13. Any atom that has 13 protons is an aluminum atom. Which statement best describes what would happen if a
proton were added to an aluminum atom?
A.
B.
C.
D.
The atom would lose electrons.
The atom would have a negative charge.
The atom would no longer be aluminum.
The atom would have a smaller atomic number.
____ 14. Mike is drawing a model of an atom. He will draw the electron cloud first, and then he will draw the nucleus.
Where will he draw the nucleus of the atom?
A. on the outer edge of the electron cloud
B. among the electrons in the electron cloud
C. between the center of the atom and the electron cloud
D. in the center of the atom, surrounded by the electron cloud
____ 15. The chart below shows the atomic numbers and mass numbers for two elements. Element 2 has a greater
atomic number and mass number than element 1.
Atomic number
Mass number
Element 1
26
56
Element 2
31
70
How many more neutrons does element 2 have than element 1?
A.
B.
C.
D.
5
9
14
39
____ 16. Which model of an atom is correctly labeled?
A.
B.
C.
D.
____ 17. Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of
calcium?
A.
B.
C.
D.
an atom of calcium
a proton from a calcium atom
an electron from a calcium atom
a molecule that contains calcium
____ 18. Which of these statements describes a fact about an atom’s nucleus?
A.
B.
C.
D.
It is negatively charged.
It is smaller than an electron.
It is the same size in all atoms.
It is made of neutrons and protons.
____ 19. Which of these statements describes a fact about an electron cloud?
A.
B.
C.
D.
It is the most massive part of an atom.
It is made up of electrons and neutrons.
It is where an atom’s electrons are found.
It is located in the center of an atom’s nucleus.
____ 20. An atom of the element gallium (Ga) has 31 protons and 39 neutrons. What is the atomic number of gallium?
8
A.
B. 31
C. 39
D. 70
____ 21. Why is the mass of an atom’s electrons not included in the atom’s mass number?
A.
B.
C.
D.
The electrons move so fast that their mass cannot be measured.
The electrons’ negative charge cancels out their masses.
The electrons’ mass is represented in the atomic number.
The electrons are much less massive than the rest of the atom.
____ 22. Look at the pairs of particles listed. Which pair has masses that are most similar?
A. neutron and proton
B. electron and proton
C. nucleus and neutron
D. electron and nucleus
____ 23. Atoms are a basic building block of certain types of matter. Atoms make up the elements that combine to
form compounds to make up much of what we use every day. Which of these substances is NOT made out of
atoms?
A.
B.
C.
D.
oxygen
protons
trees
carbon dioxide
____ 24. What is the smallest particle of an element that has all the chemical properties of the element?
A.
B.
C.
D.
an atom
a molecule
an electron
the nucleus
Short Answer
1. The element lithium (Li) has an atomic mass of 3 and a mass number of 7.
Explain how you know that the diagram above represents a lithium atom.
2. The element lithium (Li) has an atomic number of 3.
Identify what each label stands for in the atom model.
Explain how you know that the diagram above represents a lithium atom.
Essay
1. How does the atomic theory relate to your life?
2. Describe the particles that make up an atom.
Unit 2, Lesson 4 Study Guide
Answer Section
MULTIPLE CHOICE
1. ANS: D
A is incorrect because all the other answer choices are particles within an atom, and so they are all smaller
than an atom.
B is incorrect because a nucleus contains protons and neutrons and is thus larger than those particles.
C is incorrect because a proton is larger than an electron.
D is correct because an electron is the smallest particle in an atom.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50e1eab3-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms| atomic theory | electron
MSC: Test Generator
2. ANS: C
A is incorrect because the mass of an atom includes the mass of all the protons, neutrons, and electrons in the
atom.
B is incorrect because a nucleus can contain multiple protons as well as neutrons.
C is correct because a neutron has a mass similar to the mass of a proton.
D is incorrect because an electron’s mass is very small compared to the mass of a proton.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50e44d0e-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: proton | atom | neutron | nucleus
MSC: Test Generator | IN g8_u2 Lesson4 Quiz
3. ANS: A
A is correct because the matter that makes up both objects is composed of atoms.
B is incorrect because mass number is a quantity used to describe a particular atom, not an entire object.
C is incorrect because the chair and the balloon contain different substances made up of different
arrangements of atoms.
D is incorrect because the chair and the balloon are likely made up of a different number of atoms.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Comprehension | Bloom's Revised: Understanding
REF: 50e6af69-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.1
TOP: Atomic Theory: Describe the atomic theory.
KEY: matter | atomic theory |atoms
MSC: g8_unit6 Lesson Quiz | IN g8_u2 Lesson4 Quiz
4. ANS: C
A is incorrect because atoms always have only one nucleus.
• B is incorrect because the atomic number of an element is equal to the number of protons in an atom of that
element.
C is correct because the number of neutrons is equal to the mass number minus the number of protons.
D is incorrect because the number of electrons in an atom is the same as the number of protons, so element 1
has 10 electrons and element 2 has 9 electrons..
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Application | Bloom's Revised: Understanding
REF: 50e911c4-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: atomic number | mass number | atom
MSC: Florida FCAT Preparation | Uses visual element | g8_unit6_Unit Test B | IN g8 ISTEP+ Practice 1
5. ANS: D
A is incorrect because A points to the nucleus.
B is incorrect because B points to a neutron.
C is incorrect because C points to a proton.
D is correct because D points to the region surrounding the nucleus, which is the electron cloud. This is where
the electrons are located.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50e938d4-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: Identify the nucleus and electron cloud in a model of an atom.
KEY: electron cloud | atom | nucleus | proton | neutron | electron
MSC: Florida Benchmark Review Preparation | Uses visual element | IN g8_u2 Pretest | IN g8_u2 ISTEP+
Review | IN ISTEP+ style
6. ANS: A
A is correct because A points to the center of the atom, called the nucleus, which contains the protons and
neutrons.
B is incorrect because B points to a neutron.
C is incorrect because C points to a proton.
D is incorrect because D points to the electron cloud.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Comprehension | Bloom's Revised: Remembering
REF: 50eb741f-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: Identify the nucleus and electron cloud in a model of an atom.
KEY: atoms| nucleus | atom model
MSC: Test Generator | Uses visual element | IN g8_u2 Unit Test B
7. ANS: D
A is incorrect because water would not be present.
B is correct because although the nucleus accounts for nearly all of the mass of an atom, it occupies only a
small portion of the total space of an atom.
C is incorrect because electrons are the smallest part of an atom.
D is correct because empty space occupies the most space in an atom.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Analysis | Bloom's Revised: Understanding
REF: 50edd67a-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms | atomic theory | atom size
MSC: Florida FCAT Preparation | g8_Benchmark Test B
8. ANS: B
A is incorrect because 85 is the number of protons in the atom.
B is correct because the atom’s mass number minus its atomic number is equal to the number of neutrons in
the atom. The mass of an electron is too small to be significant.
C is incorrect because 210 is the mass number, which is equal to the total number of protons and neutrons in
the atom.
D is incorrect because adding the atomic number and the mass number of an atom does not yield any useful
information.
PTS: 1
DIF: Cognitive Complexity: High Complexity | Student Level: Average | Depth of Knowledge 3: Strategic
Thinking | Bloom's Traditional: Analysis | Bloom's Revised: Analyzing
REF: 50edfd8a-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: mass number | atomic number | neutron | atoms
MSC: g8_unit6 Lesson Quiz | IN g8_u2 Lesson4 Quiz
9. ANS: B
A is incorrect because the atom would have a positive charge if it had only five electrons.
B is correct because the charges on the atom’s protons and electrons will cancel each other out, making a
neutrally charged atom.
C is incorrect because the atom would have a negative charge if it had more electrons than protons.
D is incorrect because the atom would have a negative charge if it had more electrons than protons.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Comprehension | Bloom's Revised: Remembering
REF: 50f29b30-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms | protons | electrons | neutron | charge
MSC: Test Generator
10. ANS: A
A is correct because a pea is tiny in comparison to a basketball, and an electron is tiny compared to a proton.
B is incorrect because a bowling ball is close in size to a basketball, and electrons are much smaller than
protons.
C is incorrect because a beach ball is bigger than a basketball, which would mean Marcus’s electron would be
bigger than his proton.
D is incorrect because a soccer ball is almost the same size as a basketball, and electrons are much smaller
than protons.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Analysis | Bloom's Revised: Applying
REF: 50f2c240-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms | protons | electron
MSC: Florida FCAT Preparation | SE Unit g8_unit6 FCAT pages
11. ANS: B
A is incorrect because the atomic number is the number of protons.
B is correct because subtracting the atomic number from the mass number gives you the number of neutrons
in an atom.
C is incorrect because the mass number is equal to the number of protons and neutrons in an atom.
D is incorrect because adding the mass number and the atomic number does not yield useful information.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Analysis | Bloom's Revised: Understanding
REF: 50f4fd8b-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: atoms | mass number | atomic number
MSC: Test Generator | g8_unit6_Unit Test A
12. ANS: C
A is incorrect because 4 is the number of protons or the number of electrons, not the mass number.
B is incorrect because 5 is the number of neutrons, not the mass number.
C is correct because the mass number is the number of protons, 4, plus the number of neutrons, 5.
D is incorrect because 13 is the sum of the protons, electrons, and neutrons, and electrons are not involved in
finding the mass number.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Analysis | Bloom's Revised: Applying
REF: 50f75fe6-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: atoms | protons | electrons| neutron | mass number
MSC: Test Generator | g8_unit6_Unit Test B
13. ANS: C
A is incorrect because adding a proton would not change the number of electrons.
B is incorrect because adding a proton to the atom would give it a positive charge.
C is correct because adding a proton would change the atomic number of the atom, which would change the
element.
D is incorrect because adding a proton would increase the atomic number.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Application | Bloom's Revised: Understanding
REF: 50f786f6-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom. |The Parts of the
Atom: State the location, charge, and relative size and mass of protons, neutrons, and electrons in an atom.
KEY: protons | atoms | atomic number
MSC: Florida FCAT Preparation | SE Unit g8_unit6 FCAT pages
14. ANS: D
A is incorrect because the nucleus is located at the center of the atom, not on the outer edge of the electron
cloud.
B is incorrect because the nucleus is located at the center of the atom, not in the electron cloud.
C is incorrect because the nucleus is located at the center of the atom, not between the center and the electron
cloud.
D is correct because the nucleus is in the center of the atom and is surrounded by the electron cloud.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Comprehension | Bloom's Revised: Remembering
REF: 50f9c241-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: Identify the nucleus and electron cloud in a model of an atom. |The Parts of the
Atom: State the location, charge, and relative size and mass of protons, neutrons, and electrons in an atom.
KEY: atom | nucleus | electron cloud
MSC: g8_unit6_Unit Test B | IN g8_u2 Unit Test B
15. ANS: B
A is incorrect because 5 is the difference in protons, not neutrons.
B is correct because 9 is the difference between the number of neutrons in each element. The number of
neutrons in each element is found by subtracting each element’s atomic number from its mass number.
C is incorrect because 14 is the difference between the mass numbers, not in the number of neutrons.
D is incorrect because 39 is the number of neutrons in element 2, not the difference between the number of
neutrons in each element.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50f9e951-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: neutron | atomic number | mass number
MSC: Florida FCAT Preparation | Uses visual element | g8_unit6_Unit Test A
16. ANS: C
A is incorrect because all the particles are labeled incorrectly.
B is incorrect because the neutron and nucleus are labeled incorrectly.
C is correct because all the particles are labeled correctly.
D is incorrect because the proton and neutron are labeled incorrectly.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50fc249c-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.1 | 8.1.4
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms | protons | neutron | nucleus | electrons | atom model
MSC: IN g8 ISTEP+ Practice 2 | IN ISTEP+ style | Uses visual element
17. ANS: A
A is correct because an atom is the smallest particle of an element that has the chemical properties of that
element.
B is incorrect because a proton from a calcium atom is smaller than an atom and does not have the same
chemical properties of calcium.
C is incorrect because an electron from a calcium atom is smaller than the atom itself and does not have the
same chemical properties of calcium.
D is incorrect because a molecule that contains calcium is larger than an atom of calcium and would have
different properties than calcium.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 50feae07-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.1
TOP: Atomic Theory: Define atom.
KEY: atom | atomic theory | electron | nucleus | property
MSC: g8_unit6 Lesson Quiz | IN g8_u2 Lesson4 Quiz
18. ANS: D
A is incorrect because a nucleus has a positive charge.
B is incorrect because an electron is significantly smaller than a nucleus.
C is incorrect because the nucleus of some atoms may be different sizes, depending on which element it is.
D is correct because neutrons and protons make up the nucleus.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 51034bad-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: nucleus | atoms | neutron | protons
MSC: Test Generator
19. ANS: C
A is incorrect because the mass of a proton is almost 2,000 times greater than the mass of an electron.
B is incorrect because the electron cloud includes only electrons.
C is correct because the electron cloud is where all the electrons in the atom are located.
D is incorrect because the nucleus is in the center of an atom, and the electron cloud surrounds the nucleus.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Knowledge | Bloom's Revised: Remembering
REF: 510372bd-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: electron cloud | electrons| atoms
MSC: Test Generator
20. ANS: B
A is incorrect because the atomic number of protons is not the neutrons minus the protons.
B is correct because the atomic number is the same as the number of protons.
C is incorrect because the atomic number is not the number of neutrons.
D is incorrect because the atomic number of protons is not the number of protons plus the number of
neutrons.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Student Level: Basic | Depth of Knowledge 1: Recall |
Bloom's Traditional: Comprehension | Bloom's Revised: Remembering
REF: 5105ae08-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: protons | neutron | atomic number MSC: Florida FCAT Preparation
21. ANS: D
A is incorrect because the mass of an electron can be found despite its speed.
B is incorrect because electric charge does not affect mass.
C is incorrect because the atomic number represents the number of protons in an atom.
D is correct because electrons have a mass that is a very small fraction of the mass of a proton, so its mass is
negligible compared to the mass of the rest of the atom.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Comprehension | Bloom's Revised: Understanding
REF: 51083773-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atom | mass number | atomic number | electron
MSC: g8_unit6 Lesson Quiz | IN g8_u2 Lesson4 Quiz
22. ANS: A
A is correct because a neutron and proton are about the same mass; together their masses make up the atomic
mass.
B is incorrect because the mass of a proton is about 2,000 times as great as the mass of an electron.
C is incorrect because a neutron is part of the nucleus.
D is incorrect because an electron has less mass than either a neutron or proton, and the nucleus is made up of
both protons and neutrons. So, the mass of an electron is much less than the mass of a nucleus..
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Depth of Knowledge 2: Basic Application of Skill | Student
Level: Average | Bloom's Traditional: Analysis | Bloom's Revised: Analyzing
REF: 510cd519-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms| neutron | electrons| protons | nucleus | mass
MSC: Test Generator
23. ANS: B
A is incorrect because oxygen gas is composed of two oxygen atoms chemically joined together.
B is correct because protons are one of several types of particles that make up atoms.
C is incorrect because trees are composed of many atoms.
D is in correct because carbon dioxide is composed of carbon and oxygen atoms.
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Depth of Knowledge 1: Recall | Student Level: Basic |
Bloom's Traditional: Analysis | Bloom's Revised: Analyzing
REF: 25BE7003-04FB-4E32-9B0A-6885C535DA13
OBJ: g6_PC_85260_TheAtom
TOP: Atomic Theory: Define atom.
KEY: atom | electron | element
MSC: IN g8_u2 ISTEP+ Review | IN ISTEP+ style
24. ANS: A
A is correct because an atom is the smallest particle of an element that has the same chemical properties of
that element.
B is incorrect because a molecule is made up of more than one atom, and an atom is the smallest particle that
has the chemical properties of the element.
C is incorrect because an electron is a component of an atom, and it does not have the chemical properties of
the element it is in.
D is incorrect because a nucleus is a component of an atom, and it does not have the chemical properties of
the element it is in.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Application | Bloom's Revised: Understanding
REF: b6367091-7d3f-11df-9c82-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4 | 8.1.5 TOP: Atomic Theory: Define atom.
KEY: atom | chemical properties | atomic theory
MSC: IN g8 ISTEP+ Practice 1 | Uses visual element
SHORT ANSWER
1. ANS:
Sample answer: The diagram shows an atom that has 3 protons and 4 neutrons. Because the atomic mass of an
atom is equal to the number of protons in the atom (3 for lithium) and the mass number of an atom is equal to
the number of protons plus the number of neutrons in the atom (7 for lithium), the diagram can be recognized
as representing lithium.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Comprehension | Bloom's Revised: Understanding
REF: 510f5e84-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom. |The Parts of the Atom: Determine the atomic number and mass number of an atom.
KEY: atom model | atomic number | mass number
MSC: Test Generator | Uses visual element | g8_unit6_Unit Test A
2. ANS:
Key Elements:
• A. nucleus; B. neutron; C. proton; D. electron cloud
AND
• The diagram shows an atom that has 3 protons. Because the atomic number of an atom is equal to the
number of protons in the atom (3 for lithium), the diagram can be recognized as representing lithium.
Rubric:
2 points
1 point
0 point
Two key elements
One key element
Other
PTS: 1
DIF: Cognitive Complexity: Low Complexity | Depth of Knowledge 1: Recall | Bloom's Traditional:
Knowledge | Bloom's Revised: Remembering | Student Level: Low
REF: F96D93CA-3E04-4192-92DF-024B1A1C7B68
OBJ: g6_PC_85260_TheAtom
STA: 8.1.4
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atom | atomic number | mass number
MSC: IN g8_u2 Unit Test A
ESSAY
1. ANS:
Sample answer:
The atomic theory states that all matter is made up of small particles called atoms. Therefore, I am
made of atoms, and everything that I come in contact with is made of atoms. Atoms combine in various ways
to make up the substances I encounter every day.
Students’ answers should include:
• All matter is made of atoms.
• Everything that the student encounters is made of atoms, including the student’s own body.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Synthesis and Evaluation | Bloom's Revised: Creating
REF: 511199cf-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: Atomic Theory: Describe the atomic theory.
KEY: atomic theory | atoms | matter
MSC: Test Generator
2. ANS:
Sample answer:
Atoms are made up of protons, neutrons, and electrons. Protons are positively charged, electrons are
negatively charged, and neutrons have no charge. Protons and neutrons have about the same mass and make
up the nucleus of the atom. Electrons are much less massive than protons or neutrons and are found in
electron clouds that surround the nucleus.
Students’ answers should include:
• Atoms are made of protons, electrons, and neutrons.
• Protons are positively charged, electrons are negatively charged, and neutrons have no charge.
• Protons and neutrons have approximately the same mass, and electrons are much less massive.
PTS: 1
DIF: Cognitive Complexity: Moderate Complexity | Student Level: Average | Depth of Knowledge 2: Basic
Application of Skill | Bloom's Traditional: Synthesis and Evaluation | Bloom's Revised: Analyzing
REF: 5113fc2a-e685-11de-9c72-001185f0d2ea
OBJ: g6_PC_85260_TheAtom
TOP: The Parts of the Atom: State the location, charge, and relative size and mass of protons, neutrons, and
electrons in an atom.
KEY: atoms| neutron | electrons
MSC: Test Generator