Download Chemistry Standard 2A-Nucleus Section 20.1

Chemistry Standard 2A-Nucleus Section 20.1 Practice
Name __________
1. Which of the following particles is smaller than the rest? Page answer is found ____________
a. electron
c. neutron
b. proton
d. alpha particle
2. The attractive force between protons and neutrons in a nucleus caused by the strong nuclear force acts
only
Page answer is found ____________
a. outside the nucleus.
c. only in unstable isotopes.
b. over a very short distance.
d. intermittently.
3. Radioactive materials have unstable
a. electrons.
b. nuclei.
Page answer is found ____________
c. protons.
d. neutrons.
4. The stability of an isotope nucleus depends on the ____.
Page answer is found ____________
a. valence electrons
c. number of neutrons
b. atomic number
d. neutron-to-proton ratio
5. What is the process in which an unstable atomic nucleus emits charged particles or energy or both? Page
answer is found ____________
a. radioactivity
c. decomposition
b. oxidation
d. none of the above
6. When the ____ is not large enough to hold a nucleus together tightly, the nucleus can become radioactive.
Page answer is found ____________
a. electric force
c. tracer
b. strong force
d. Isotope
7. Nuclei with too many or too few neutrons are…. Page answer is found ____________
a. never found.
c. unnatural.
b. unstable.
d. stable.
8. The process of nuclear change in a radioactive atom is called Page answer is found ____________
a. nuclear decay.
c. nuclear mass.
b. isotopes.
d. radon.
9. Diagram and label the nuclear forces that effect a U-238 and Carbon-14 nucleus
10. List the causes of radioactivity