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Transcript
19.1 Reinforcement WKT Directions: Answer the following questions on the lines provided. 1. How is the chemical symbol of an element determined? 2. Of what are atoms composed? 3. Are electrons, protons, or neutrons the smallest particles? If not, what are? 4. How many types of quarks are there and what is the name of one of them? 5. Why do scientists use models to study atoms? 6. Why has the atomic model changed over time? 7. Why is the current atomic model called the “Electron Cloud Model”? Directions: Match the term in Column I with the definition in Column II. Write the letter of the correct definition in the blank at the left. Column I Column II 8. electron a. positively charged particle 9. neutron b. negatively charged particle 10. nucleus c. neutral particle 11. proton d. smaller particles that make up protons 12. quark and neutrons e. positively charged center of an atom Meeting Individual Needs
