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Name ______________________________________ Chemistry Atomic Theory Worksheet 1. Describe what was involved in JJ Thomson’s study of the Cathode Ray Tube. 2. Describe what was involved in R. Millikan’s Oil Drop Experiment. 3. Describe what was involved in E. Rutherford’s Gold Foil Experiment. 4. Atoms are very small, what unit are they measured in? 5. What holds an atom together? 6. Label the parts on the following diagram of an atom: 7. Identify the key properties of the following atomic particles: Atomic Particle Proton Neutron Electron Symbol Charge Mass 8. Identify how you would determine the following information: a. number of protons = b. number of electrons = c. number of neutrons = d. mass number = e. the charge on an ion = 9. What does it mean for an atom to be a. neutral – b. an ion – c. an isotope 10. How do you represent an isotope (how is it to be written)? 11. What does amu stand for? 12. What is a nuclear symbol? Give an example and tell what it is made up of. 13. Complete the following chart: Element Element Atomic Atomic Name Symbol Mass Number Tin Mn 78 Helium P Mass Number Number Number Number Protons Neutrons Electrons