Radioactive Decay, Isotopes Worksheet With Answers
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141. Which equation represents the radioactive decay
5. In the equation:
226
of
Ra?
88
234
234
Pa →
U + X
226
Ra -
222
4
1)
Rn +
He
91
92
88
86
2
226
Ra -
226
0
2)
Ac +
e
88
89
–1
The X represents a
226
Ra -
226
0
3)
Fr +
e
88
87
+1
226
Ra -
225
1
1) helium nucleus
3) proton
4)
Ra +
n
88
88
0
2) beta particle
4) neutron
2. The chart below shows the spontaneous nuclear
decay of U-238 to Th-234 to Pa-234 to U-234.
6. According to the equation:
208
4
X →
Pb +
He
82
2
The nucleus correctly represented by X is
204
1)
Hg
80
212
2)
Po
84
204
3)
Bi
80
212
4)
Pb
84
7. In the equation:
234
234
Th →
Pa + X
90
91
Which particle is represented by X?
What is the correct order of nuclear decay
0
1)
e
modes for the change from U-238 to U-234?
–1
4
‚
‚
2)
He
1) î
decay, decay, î
‚
decay
2
1
‚
‚
3)
H
2) î
decay, î
decay, í decay
1
0
‚
4)
e
3) í decay, í decay, î
decay
+1
‚
‚
4) í decay, î
decay, î
decay
8. In the equation:
3. Which product of nuclear decay has mass but no
226
222
Ra →
Rn + X
charge?
88
86
1) alpha particles
3) gamma rays
X represents
2) neutrons
4) beta positrons
1) a neutron
3) a beta particle
2) a proton
4) an alpha particle
4. In the equation:
239
234
9. Given the reaction:
Th →
Pa + X
40
91
234
0
Pa → X +
e
The symbol X represents
91
–1
0
1)
e
+1
When the equation is correctly balanced the
0
2)
e
–1
nucleus represented by X is
1
3)
n
0
234
1)
U
1
4)
92
H
1
235
2)
U
92
230
3)
Th
90
232
4)
Th
90
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