/ Atomic Theory / Name:
Date:
Period: #

After reading about the Development of the Atomic Theory(pp.125-130), please answer the following questions on a separate piece of paper and in complete sentences.

  1. Democritus believed that matter was made of smaller parts he called “atomos”. What does “atomos” mean?
  2. What isDalton’s theory about atoms? (summarize in your own words)
  3. What did Dalton realize about the elements in a compound? (hint H2O)
  4. What particles did Thomson discover?
  5. What did Thomson hypothesize about the rest of the atom?
  6. Draw and label Thomson’s model of the atom.
  7. Rutherforddiscovered a difference in his research and Thomson’s previous work, what was that difference?
  8. Describe Rutherford’s model of the atom.
  9. How is Rutherford’s modellike a fruit with a pit? (see figure 5)
  10. Who suggested that electrons travel in definite paths?
  11. What is the newest atomic theory called?
  12. Can the path of an electron be predicted in this new model? Explain.
  13. Why was it difficult for Chadwick to discover the neutron?
  14. What are two characteristics of the neutron?
  15. How are the charges of electrons and protons related?
  16. What makes up most of the mass of an atom?

/ Atomic Theory / Name:
Date:
Period: #

After reading about the Development of the Atomic Theory (pp. 125-130), please answer the following questions on a separate piece of paper and in complete sentences.

  1. Democritus believed that matter was made of smaller parts he called “atomos”. What does “atomos” mean?
  2. What isDalton’s theory about atoms? (summarize in your own words)
  3. What did Dalton realize about the elements in a compound? (hint H2O)
  4. What particles did Thomson discover?
  5. What did Thomson hypothesize about the rest of the atom?
  6. Draw and label Thomson’s model of the atom.
  7. Rutherforddiscovered a difference in his research and Thomson’s previous work, what was that difference?
  8. Describe Rutherford’s model of the atom.
  9. How is Rutherford’s model like a fruit with a pit? (see figure 5)
  10. Who suggested that electrons travel in definite paths?
  11. What is the newest atomic theory called?
  12. Can the path of an electron be predicted in this new model? Explain.
  13. Why was it difficult for Chadwick to discover the neutron?
  14. What are two characteristics of the neutron?
  15. How are the charges of electrons and protons related?
  16. What makes up most of the mass of an atom?