Test: Ch. 6 – Introduction to Atoms
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. The smallest particle into which an element can be divided and still have the properties of that
element is called a(n)
a. nucleus.
b. electron.
c. atom.
d. neutron.
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2. How would you describe the nucleus?
a. dense, positively charged
b. mostly empty space, positively charged
c. tiny, negatively charged
d. dense, negatively charged
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3. Where are electrons likely to be found?
a. in the nucleus
b. in electron clouds
c. mixed throughout an atom
d. in definite paths
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4. Every atom of a given element has the same number of
a. protons.
b. neutrons.
c. electrons.
d. isotopes.
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5. Which statement is true about isotopes of the same element?
a. They have the same number of protons. b. They have the same number of neutrons.
c. They have a different atomic number.
d. They have the same mass.
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6. Which phrase describes radioactive isotopes?
a. They are stable.
c. They are unstable.
b. They never change.
d. They don’t produce energy.
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7. Which of the following has the least mass in an atom?
a. nucleus
b. proton
c. neutron
d. electron
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8. An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
a. 39.
b. 158.
c. 197.
d. 276.
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9. Which of the following has a negative charge?
a. nucleus
b. proton
c. neutron
d. electron
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10. If an isotope of uranium, uranium-235, has 92 protons, how many protons does the isotope
uranium-238 have?
a. 92
b. 95
c. 143
d. 146
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11. An atom that is a charged particle is called a(n)
a. ion
b. isotope
c. subatomic particle
d. neutron
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12. A carbon atom with 6 protons, 6 electrons, and 6 neutrons would have a mass number of
a. 6.
b. 18.
c. 12.
d. 15.
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13. In an atom, which subatomic particles are located in the nucleus?
a. protons only b. protons and neutrons c. neutrons only d. protons and electrons
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14. If hydrogen-1 has 1 proton, how many protons does hydrogen-2 have?
a. 2
b. 1
c. 3
d. 4
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15. Which of the following is NOT one of the forces at work in an atom?
Unit 3 (Ch.6) – Atom/Periodic Table
Bach
10//05/09
a. gravitational force
b. electromagnetic force
c. weak force
d. atomic force
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16. The weighted average of the masses of all the naturally occurring isotopes of an element is called
a. the atomic mass. b. the mass number. c. the atomic number. d. the atomic properties.
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17. The number of protons in the nucleus of an atom is called the
a. atomic number. b. mass number. c. atomic mass. d. atomic mass unit.
Use the figure below to answer questions 18 through 28.
QuickTi me™ and a
TIFF (U ncompressed) decompressor
are needed to see this picture.
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18. How many protons are in an atom of Potassium?
a. 39
b. 20
c. 19
d. 39.1
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19. How many neutrons are in an average atom of Calcium?
a. 20
b. 21
c. 40
d. 40.1
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20. How many electrons are in an uncharged atom of Chromium?
a. 28
b. 52
c. 76
d. 24
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21. What is the atomic number of Titanium?
a. 47.9
b. 48
c. 22
d. 26
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22. What is the mass number of an average atom of Vanadium?
a. 23
b. 50.9
c. 51
d. 50
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23. What is the atomic mass of Vanadium?
a. 23
b. 50.9
c. 51
d. 50
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24. The number of BOTH protons and neutrons in an atom of Scandium is
a. 21
b. 45
c. 24
d. 66
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25. If a Calcium atom has a charge of +2, how many protons will it have?
a. 20
b. 22
c. 18
d. 40
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26. If a Potassium atom has a charge of +1, how many electrons will it have?
a. 18
b. 19
c. 20
d. 39
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27. How many neutrons are in an average atom of Titanium?
a. 22
b. 25
c. 26
d. 47.9
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28. What is the chemical symbol for Chromium?
a. K
b. Ca c. C
d. Cr
Grading Scale
Unit 3 (Ch.6) – Atom/Periodic Table
Bach
10//05/09
( 2pt.s ea. – 3 extra credit Q’s – 50 pt.s possible)
A = 56 – 45
B = 44 – 40
C = 39 – 35
D = 34 – 30
F < 29
Ch. 6 Answer Section
1. ANS:
OBJ:
2. ANS:
OBJ:
3. ANS:
OBJ:
4. ANS:
OBJ:
5. ANS:
OBJ:
6. ANS:
OBJ:
MSC:
7. ANS:
OBJ:
8. ANS:
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MSC:
9. ANS:
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10. ANS:
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MSC:
11. ANS:
OBJ:
12. ANS:
OBJ:
MSC:
13. ANS:
OBJ:
MSC:
14. ANS:
OBJ:
15. ANS:
C
1
A
2
B
2
A
2
A
3
C
3
CTA.0.7
D
1
C
3
CTB.0.3
D
4
A
3
CTB.0.5
A
1
C
1
CTC.0.9
B
4
CTC.0.10
B
2
D
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
PTS:
STA:
1
8.3.a
1
8.3.a
1
8.3.a
1
8.3.a | 8.7.b
1
8.7.b
1
8.7.b
DIF:
KEY:
DIF:
KEY:
DIF:
KEY:
DIF:
KEY:
DIF:
KEY:
DIF:
KEY:
1
REF:
atom
MSC:
1
REF:
nucleus
MSC:
1
REF:
electron
MSC:
1
REF:
proton
MSC:
1
REF:
isotope
MSC:
1
REF:
isotope | radioactive
1
SQ.1.1
1
SQ.1.3
1
SQ.1.4
2
SQ.2.10
2
CTA.0.5
2
PTS:
STA:
PTS:
STA:
1
8.3.a
1
8.7.b
DIF:
KEY:
DIF:
KEY:
2
REF: 2
electron
MSC: CTA.0.8
1
REF: 2
mass number
PTS:
STA:
PTS:
STA:
1
8.3.a
1
8.3.a | 8.7.b
DIF:
KEY:
DIF:
KEY:
1
REF: 2
electron
MSC: CTB.0.4
1
REF: 2
isotope | proton
PTS:
STA:
PTS:
STA:
1
8.3.a
1
8.7.b
DIF:
KEY:
DIF:
KEY:
1
REF: 1
ion
MSC: CTB.0.6
1
REF: 2
mass number
PTS: 1
STA: 8.3.a
DIF: 1
REF: 2
KEY: protons and neutrons
PTS: 1
STA: 8.3.a | 8.7.b
DIF: 1
KEY: proton
Unit 3 (Ch.6) – Atom/Periodic Table
Bach
REF: 2
MSC: CTC.0.11
10//05/09
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
A
A
C
A
D
C
C
B
B
A
A
C
D
Unit 3 (Ch.6) – Atom/Periodic Table
Bach
10//05/09