1. atomic number atomic mass number of protons all of the above
Chapter 10: 1. What atomic property or properties can change when a nucleus emits radiation?
atomic number
atomic mass
number of protons
all of the above

2. 2. What a nucleus changes both its atomic mass and atomic number during a transmutation, what type of radiation was emitted?
a. 
b. 
c. positron
d. 

3. 3. What percentage of a radioactive sample will remain after 3 half-lives have passed?
b. 12.5%
c. 3%
d. 0% (it only takes 2 half-lives to degrade the sample)

4. 4. Which of the following best describes a free radical?
a. a lone electron ejected from its parent molecule by ionizing radiation
b. a charged particle formed by ionizing radiation
c. a molecule with a lone electron resulting from bond breakage
d. a molecule with a charge of 1

5. 5. Which of the following types of radiation is NOT likely to be used in diagnostic or therapeutic medical applications?  
positron 

6. 6. Which of the following medical procedures utilizes radioactivity in its application?
a. CAT scan
b. PET scan
c. MRI
d. All of the above

7. 7. Which of the following is NOT a source of nuclear energy?
a. the collision of light particles moving at high velocity
b. the collision of heavy particles moving at slow velocity
c. the bombardment of nuclei with neutrons
d. the Sun