Chemistry Early Models of the Atom Guided Inquiry Lesson

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Early Models of the Atom Guided Inquiry Lesson - Dalton, Thomson, Rutherford, and Chadwick
This is a student-centered, active learning lesson without lecture or notetaking!

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Texas Chemistry Standards (TEKS)
C.6.A: The student is expected to understand the experimental design and conclusions used in the development of modern atomic theory, including Dalton’s Postulates, Thomson’s discovery of electron properties, Rutherford’s nuclear atom, ….
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Lesson Summary:
This guided inquiry lesson enables students to construct their own understanding of four early models of the atom. They also discover how key experiments led scientists to modify their existing views of the atom. Students are able to actively learn the material without lecture or note taking.

Part 1: Dalton’s Model of the Atom
• Students compare Dalton’s model of the atom for three different elements. They discover that there is nothing in Dalton’s model that distinguishes different atoms or describes the subatomic structure of the atom.

• Students examine descriptions and illustrations of Dalton’s Postulates and create tools to help them remember each postulate.

Part 2: Thomson’s Model of the Atom
• Students compare Thomson’s model of the atom to Dalton’s model of the atom. They are asked to determine two differences between the two models.

• Students discover how positive and negative charges interact with one another by observing the bending of a water stream towards a negatively charged balloon. They develop an explanation for the phenomenon based on their understanding of the positive and negative charges in water and on the balloon.

• Students examine an illustration of Thomson’s Cathode Ray Experiment. They use their understanding of the behavior of positive and negative charges to explain the behavior of the cathode ray.

• Students relate the results of Thomson’s Cathode Ray Experiment to his modifications to the model of the atom.

Part 3: Rutherford’s Model of the Atom
• Students compare Rutherford’s model of the atom to Thomson’s model of the atom. They are asked to determine the main difference between the two models.

• Students examine an illustration of the experimental set-up for Rutherford’s Gold Foil Experiment. They then use a deck of cards showing the different paths taken by several of the particles in the experiment. The students model the results of the Gold Foil Experiment by plotting the particle path shown on each card.

• Students relate the results of Rutherford’s Gold Foil Experiment to his modifications to the model of the atom.

Part 4: Chadwick’s Model of the Atom
• Students compare Chadwick’s model of the atom to Rutherford’s model of the atom. They are asked to determine the main difference between the two models. In doing so, they discover how Chadwick modified the model of the atom based on his experiments.

Practice
Students draw the four early models of the atom for three different elements.

Student Study Sheet
Students are provided with a student study sheet summarizing all of the important concepts in this lesson.

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Learning Objectives (Bloom’s Revised Taxonomy):
Remembering: Identify illustrations of four early models of the atom.
Understanding: Explain the similarities and differences between the four early models of the atom.
Applying: Reconstruct the results of Rutherford’s Gold Foil Experiment given particle paths.
Analyzing: Analyze and interpret the results of Thomson’s Cathode Ray Experiment and Dalton’s Gold Foil Experiment.
Evaluating: Discuss how the results of Thomson’s Cathode Ray Experiment and Dalton’s Gold Foil Experiment led to new models of the atom.
Creating: Draw the atom of an element as it would appear in Dalton’s model. Thomson’s model, Rutherford’s model, and Chadwick’s model.

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Included in this Download:
• Cover page (1 page)
• Guided inquiry lesson (10 pages)
• Handout (1 page)
• Card deck showing particle paths – 6 different colored sets (18 pages)
• Student study sheets (1 pages)
• Teacher notes (2 pages)
• Guided inquiry lesson with suggested answers (10 pages)

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Total Pages
43
Answer Key
Included
Teaching Duration
50 Minutes

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Chemistry Early Models of the Atom Guided Inquiry Lesson
Chemistry Early Models of the Atom Guided Inquiry Lesson
Chemistry Early Models of the Atom Guided Inquiry Lesson
Chemistry Early Models of the Atom Guided Inquiry Lesson