Unit 13 Study Guide
1.
True or false? The nucleus is believed to be made
8.
Complete the table for these radioactive particles:
of particles called nucleons.
A)
True
Name
Charge
Mass
B)
False
Number
Alpha
2.
True or false? Atoms that have identical atomic
Beta
numbers but different mass numbers are called radiotracers.
Gamma
A)
True
B)
False
9.
Lithium-8 is a beta producer. The product nuclide is
______________.
3.
Polonium is a naturally radioactive element
230
decaying with the loss of an alpha particle.
Th decays by producing an alpha
10.
When
210
84
90
Po  42 He  ?
particle, the product nuclide is ______________.
What is the second product of this decay?
A)
214
86
Rn
B)
206
82
Pb
C)
206
85
At
D)
208
80
Hg
E)
none of these
11.
The element curium (Z = 242, A = 96) can be
produced by positive-ion bombardment when an alpha
particle collides with which of the following nuclei? Recall
that a neutron is also a product of this bombardment.
4.
Thorium-234 undergoes beta particle production.
What is the other product?
5.
A)
249
98
Cf
B)
241
94
Pu
C)
241
95
Am
D)
239
92
U
E)
239
94
Pu
A)
234
91
Pa
B)
234
89
Ac
12.
C)
233
90
Th
D)
233
91
a new nuclide is produced plus an alpha particle. The nuclide
produced is ______________.
E)
none of these
When
14
7
N is bombarded by (and absorbs) a proton,
Th
Alpha particles are
A)
electrons
B)
protons
C)
neutrons
D)
helium nuclei
E)
X rays
6.
Choose the particle having a relative mass of 0 amu
and a charge of +1.
A)
alpha particle
B)
beta particle
C)
proton
D)
neutron
E)
none of these
7.
The atomic particle having a mass of 0 amu and a
charge of -1 is
A)
an electron
B)
a neutron
C)
an alpha particle
D)
a proton
E)
none of these
13.
The cesium-131 nuclide has a half-life of 30 years.
After 90 years, about 6 g remains. The original mass of the
cesium-131 sample is closest to
A)
30 g
B)
40 g
C)
50 g
D)
60 g
E)
70 g
14.
The half-life of a radioactive nuclide is
A)
that period of time in which 25% of the
original number of atoms undergoes radioactive
decay.
B)
the time at which the isotope becomes
nonradioactive.
C)
that period of time in which 50% of the
original number of atoms undergoes radioactive
decay.
D)
the period of time it takes to reduce the
radioactivity by 100%.
E)
none of the above
Unit 13 Study Guide
15.
The iodine-131 nuclide has a half-life of 8.0 days.
20.
How many neutrons are produced?
If you originally have a 642-g sample, after 2.0 months you
A)
2
will have (Ignore significant figures for this problem.)
B)
3
A)
48 g
C)
4
B)
56 g
D)
5
C)
123 g
E)
6
D)
3.5 g
E)
less than 1 g
21.
How many electrons are produced?
16.
A sample of a radioactive element decays to 3.15%
A)
2
of its original number of radioactive nuclides in 36 years.
B)
3
What is the half-life of this radioactive element?
C)
4
A)
41 years
D)
5
B)
780 years
E)
6
C)
3.6 years
D)
14 years
22.
When the palladium-106 nucleus is struck with an
E)
7.2 years
alpha particle, a proton is produced, along with a new
element. What is this new element?
17.
A particular radioactive element has a half-life of
A)
cadmium-112
2.00 weeks. What percent of the original sample is left after
B)
cadmium-109
31.7 days?
C)
silver-108
A)
20.8%
D)
silver-109
B)
73.6%
E)
none of these
C)
79.2%
D)
2.26%
23.
A particular radioactive element has a half-life of
E)
none of these
1.20 years. What percent of the original sample is left after
194.4 days?
18.
A sample of a radioactive element decays to 26.1%
A)
26.5%
of its original amount of radioactive nuclides in 15 years.
B)
73.5%
What is the half-life of this radioactive element?
C)
36.8%
A)
34. years
D)
24.5%
B)
2.7 years
E)
21.0%
C)
7.7 years
D)
92.3 years
24.
True or false? A breeder reactor is one that
238
E)
9.0 years
U from 235 U .
produces
92
19.
A particular radioactive element has a half-life of
8.89 days. What percent of the original sample is left after
15.0 days?
A)
68.9%
B)
55.7%
C)
15.5%
D)
62.1%
E)
31.1%
Use the following to answer questions 20-21:
When the uranium-235 nucleus is struck with a neutron, the
cesium-144 and strontium-90 nuclei are produced, along with
some neutrons and electrons.
A)
B)
25.
such as
92
True
False
True or false? Nuclear fusion uses heavy nuclides
235
92
U as fuel.
A)
B)
True
False
26.
Strontium-90 from radioactive fallout is a health
threat because, like ______________, it is incorporated into
bone.
A)
iodine
B)
cesium
C)
iron
D)
calcium
E)
uranium
Unit 13 Study Guide
1. Ans: A
2.
3.
4.
5.
6.
7.
Ans:
Ans:
Ans:
Ans:
Ans:
Ans:
B
B
A
D
E
A
8. Ans:
Alpha
Beta
Gamma
Name
2
-1
0
8
9. 4 Be
12.
10.
226
88
11.
Ans: E
Ans:
11
6
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
Ra
C
Ans: C
Ans: C
Ans: D
Ans: E
Ans: A
Ans: C
Ans: E
Ans: A
Ans: C
Ans: D
Ans: B
Ans: B
Ans: B
Ans: D
Charge Mass Number
4
0
0