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Topic 12: Nuclear Chemistry

9. Positron emission: Recalling concept facts

1. As an atom of a radioactive isotope emits a positron, the mass number of the atom
3) Remains the same

1) Increases
2) Decreases

2. As a radioactive isotope emits a positron , the atomic number of the atom
1) Decreases 2) Increases 3) Remains the same

3. When a radioisotope undergoes a positron emission, the number of protons of the atom will
1) Increase 2) Decrease 3) Remain the same
4. As a radioisotope releases a positron during a nuclear decay, the number of neutrons will
1) Decrease

3) Remain the same

2) Increase

5. When a positron is emitted by an atom, the atomic number of the atom
1) Increases by 1 2) Increases by 2 3) Decreases by 1 4) Remains the same

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

10. Positron emission: Determining positron emission equations

1. Which nuclear transmutation involves a positron emission? 3) K ---------------- Ar + p
1
37
4
235
239
38

Pu -----------
1 )

U + He
94 92 2 19 18 1
11
16
0
0
11
16
2) N ------------- O + e 4) C ---------------- B + e
7 8 -1 6 5 +1
2. Which nuclear disintegration is accompanied by the emission of a positron? 0 24
0
13
24
13
1 ) N --------------- C + e 3) Na + e ----- Mg
7 6 +1 11 +1 12

137
4
0
249
2 ) Cs ------------ 137 Ba + e 4) Cf --------------- 245 Cm + H
55 56 -1 98 96 2
3. Which nuclear reaction involves the emission of a positron?
1 ) 9 Be + H --- Li + X 3) F ----------------- O + X
6
18
18
1
4 1 3 9 8
14
1
14
2 ) 234 Th ------------ 234 Pa + X 4) N + n ------ C + X
90 91 7 0 6

11. Artificial transmutation: Determining artificial transmutation equations
1. Artificial transmutation is represented by which balanced nuclear equation?
0
4
1) 218 At ----------------- 218 Rn + e 3) 239 Pu ------------ 235 U + He
85 86 -1 94 92 2
1 2 3 11 4 14 1
4) B + He ----- N + n
2) H + H ------- He 5 2 7 0
1 1
2

2. Which equation is an example of artificial transmutation?
1) 1 n + N ------ C + H 3) K ---------------- Ar + p
38
1
37
14
14
1
0 7 6 1 19 18 1
3
2
2
4
2) 212 Po ---------------- 208 Pb + He 4) H + H ----- He
84 82 2 1 1 2
3. Artificial transmutation is represented by which equation? 3) Be -------------- B + e
10
10
43
0
43
0
1)

Sc -------------- Ca + e

21 20 +1 4 5 -1
32
2) 235 U + n ----- 139 Ba + Kr + 3 n 4) S + n -------- P + H
1
94
1
32
1
1
92 0 56 36 0 16 0 15 1

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