Name
Chemistry: Nuclear Chemistry Review
Define the particles of radiation and indicate their notation.
1. Alpha particle:
2. Beta particle:
3. Gamma ray:
4. Positron:
Complete the following nuclear transformations.
1.
66
29
Cu 
2.
14
6
C 
+
3.
238
92
U
+
4.
8
5
B
8
4
Be +
5.
27
13
Al +
4
2
He 
66
30
Cu +
30
14
0
-1
e
4
2
He
Si +
Complete the following half-life problems. Show all work!
1. The mass of cobalt-60 in a sample is found to have decreased from 0.800 g to 0.200 g in a period of 10.5 yrs.
From this information, calculate the half-life of cobalt-60.
2. If the half-life of iodine – 131 is 8.10 days, how long will it take a 50.00 g sample to decay to 6.25 g?
3. A radioactive isotope has a half-life of 4 days. How much of a 20 gram sample of this isotope remains after
12 days?
4. The half-life of potassium-40 is 1.25 x 109 years. If there are 12.5 g of the sample left after 3.75 x 109 years,
how many grams were in the original sample?