Chapter 25
Nuclear Equations Worksheet
Problems
Complete the following nuclear equations and state the type of nuclear decay.
4
1. 210
__________________________________
84 Po  _______  2 He
8
5
2.
B  48 Be  _______
3. _______ 
234
91
Pa  e  
0
1
C  _______  10 e
14
6
4.
5. ______ 
81
37
Rb 
81
36
Kr + X-ray photon
6. O  N  ______
15
8
15
7
Ni  e  _______
7.
58
28
8.
226
88
0
1
Ra 
222
86
Rn  ______  
n  _____  10 e
9*
1
0
10.
238
92
__________________________________
__________________________________
__________________________________
__________________________________
__________________________________
__________________________________
__________________________________
__________________________________
U  _______  He
4
2
___________________________________
Complete the following nuclear equations.
11. 49 Be  24 He  _____  01n
20. 189 F  178 O  _____
12. ______ 
Cu 
13.
66
29
14.
27
13
15.
141
56
66
30
239
94
Pu  10 e
Zn  ______
H  _____  24 He  01n  energy
21.
2
1
22.
27
14
Si  10 e  ______
30
Al  ______  14
Si  11H
23. ______  24 He  21081Tl
Ba  ______  10 e
24.
32
15
16. ______  24 He  178 O  11 p
25.
142
61
4
17. ______  181
77 Ir  2 He
26.
14
7
27.
13
6
28.
239
94
18.
241
95
Am  _____  237
93 Np
19. ______  126 C 
Cf  n
246
98
P  ______  10 e
Pm  _____  142
60 Nd
N  _____  146 C  11 p
C  01n  ______
Pu  24 He  11H  2 01n  ______
Half-Lives
29. If gallium-68 has a half-life of 68.3 minutes, how much of a 10mg sample is left after two half-lives?
30. If the passing of five half-lives leaves 25.0mg of a strontium-90 sample, how much was present in the
beginning?
31.The radioisotope cesium-137 has a half-life of 30 years. A sample decays at the rate of 544counts/min
(544cpm) in 1985. In what year will the decay be 17cpm?
32. Manganese-56 is a beta emitter with a half-life of 2.6hr. What is the mass of manganese-56 in a 1mg
sample of the isotope after 10.4hr?
33. Nitrogen-13 emits beta radiation and decays to C-13 with t1/2 = 10min. Assume a starting mass of
2.0g of N-13. How many grams of that isotope will remain after 40min?
34. The radioisotope Mo-91 has a t1/2 of 15.5min. A sample decays at the rate of 954counts/min
(954cpm). After how many minutes will the decay be 7.45cpm?