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. 12: Nuclear Chemistry
Topic

6. Alpha Decay - Natural Transmutation: Recalling concept facts

1. As an atom of a radioactive isotope emits an alpha particle, the mass number of the atom

1) Increases
2) Decreases
3) Remains the same

2. As a radioactive isotope emits an alpha particle, the atomic number of the atom
1) Decreases 2) Increases 3) Remains the same
3. When a radioisotope undergoes an alpha decay, the number of protons of the atom will

2) Decrease
1) Increase
3) Remain the same

4. As a radioisotope undergoes releases alpha particle during a nuclear decay, the number of
neutrons will
1) Decrease 2) Increase 3) Remain the same

5. When an alpha particle is emitted by an atom, the atomic number of the atom
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1) Increases by 2 3) Increases by 4
2) Decreases by 2 4) Decreases by 4

6. As a radioactive isotope undergoes an alpha decay, the mass number of the atom
1) Increases by 2 3) Decreases by 4
2) Increases by 4
4) Remains unchanged

7. Compared to an atom before an alpha decay, the number of protons of the atom after alpha
decay will be
1) Greater by 4 3) Lesser by 2
2) Greater by 2 4) The same

7 Alpha decay: Recognizing alpha decay equations
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1. Which nuclear decay equation correctly represents alpha decay? Th ------------- 234 Pa + e
116
116
234
0
0
In ----------------
3)

Sn + e
1)
49 50 -1 90 91 +1
1
4
38
37
2) K --------------- Ar + p 4) 226 Ra ------------ 222 Rn + He
19 18 1 88 86 2
2. Which equation represents nuclear disintegration resulting in the release of an alpha particle?
1) Al + He ----- P + n 3) Ar + e ----- Cl
37
4
30
1
27
0
37
13 2 15 0 208 18 -1 17 0
4
14
14
212
Bi -------- He +
Ti
2) 83 2 81 4) C --------------- N + e
6 7 -1
3. A nuclear change resulting in a release of an alpha particle is shown in which equation?
4
4
1) 252 Cf ------------- 248 Cm + He 3) 220 Fr + He ---- 224 Ac
87 2 89
98 96 2
2) Ne ------------- Na + e 4) 228 Ac ------------ 228 Ra + p
1
19
19
0
10 11 -1 89 88 1
4. Which nuclear equation below represents a decay with emission of an alpha particle?
239
218
235
218
U + X
3)
At --------------
1)

Pu ------------
Rn + X
85 86 94 92
11
2
1
1
14
2) H + H------- X 4) B + X ----- N + p
1 1 5 7 0
5. Which equation represents a nuclear decay with the released of an alpha particle?
32
1
32
1) 239 Np ------------- 239 Pu + X 3) P + p ------ S + X
93 94 15 1 16
2) 228 224 37
37

Ra + X
4) Ar -------------- Cl + X
Th --------------
90 88 18 17

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