Download 25.1.WS.ANS

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Class
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Part A Completion
and terms
Use this completion exercise to check your understanding of the concepts
short
term,
that are introduced in this section. Each blank can be completed with a
phrase, or number
2
.
and are called
1
Isotopes with unstable nuclei are
3 of radioisotopes decay to
The
5
plus emission of large amounts of
.
4
nuclei
The radiation may
1.
2.
3.
i
be alpha,
_,
radiation consists of
7
or gamma.
8
alpha particles (positively charged
nuclei) that are easily
stopped by a sheet of paper. Beta radiation is composed of
Beta radiation is more
fast-moving particles, which are
penetrating than alpha radiation; it is stopped by
_iQ.
radiation is electromagnetic radiation. Gamma radiation
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has no
_i
or electrical charge. It is extremely penetrating.
1L_ bricks and
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reduce the intensity of gamma
radiation but do not completely
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it.
4.
ii’
1
5.
6.
7.
8.
C( S
9.
io.
11.
i,cJ
(CfWY’C\
)
12.
13.
I
14.
‘5.
Part B True-Fake
Classij5i each of these statements as always true, AI sometimes true, SI or never true, NT
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16. Beta radiation is emitted when a radioisotope decays.
17. Gamma radiation has a negative charge
\
\ rn.
19.
Gamma radiation is high-ener electromagnetic radiation.
9u
+
e
20. When a beta particle is emitted, the atomic number increases by 1, and
the mass number stays the same.
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Part C Matching
lumn A.
umn B to the correct term in Co
Match each description in Col
Column B
Column A
table nucleus releases
a. the process in which an uns
energy by emitting radiation
21. radioisotopes
le nuclei and undergo
b. isotopes that have unstab
radioactive decay
mass or electrical charge
c. high-energy photon with no
breaking apart of a
d. electrons resulting from the
neutron in an atom
22. radioactive decay
23. gamma ray
L#
‘—
d
24. alpha particles
a radioactive source
e.. helium nuclei emitted from
.
25. beta particles
Part D Problems
ce provided.
Answer the following in the spa
these processes.
26. Write nuclear equations for
a. The alpha decay of 9Po
—
4jI
2M
t
Pb
b. The beta decay of 2
ATION
SECTION 25.1 NUCLEAR RADI
an atom that
number and atomic number of
ss
ma
the
to
s
pen
hap
at
Wh
1.
)CS
c îç
undergoes beta decay? LTV
How do the
nt undergoea1pha particle decay.
2. A radioisotope of an eleme
ber of the particle change? %ç 4c ,
atomic number and mass num
nucleus of the following isotopes.
3. Give the composition of the
95u
‘
C. A
j
b • 136
53
1
N
64
a. 28
ing equations.
4. Complete each of the fow
n
a. ‘C—_?e +?
m
2
b. A
-
He
+
c. ‘N—>’O+?
‘
?
2
4i
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