Directions: Draw an atom model. Use all the terms below to label your drawing. Then write a sentence to explain each term.
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1 7 th Grade Science UNIT 1: Properties of Matter Name Date: Lesson 9 Do Now AIM: SWBAT how the model of an atom changed over time. Directions: Draw an atom model. Use all the terms below to label your drawing. Then write a sentence to explain each term. atom electron neutron nucleus proton 1. Atom 2. Electron 3. Neutron 4. Nucleus 5. Proton
2 ATOMIC THEORY Early Ideas About Matter Contrast ideas about matter held by Greek philosophers. Democritus Aristotle all matter made of four elements: Ideas About Matter Acceptance of Ideas Dalton s Atomic Model Restate theories in Dalton s atomic model. cannot be cannot be All matter is made of atoms that are identical to are different from combine in
3 The Atom Describe how present scientists characterize the atom. Definition: Location of empty space: Size: Atom Made of: Thompson Discovering Electrons Sequence the discovery of the electron and the development of Thompson s atomic model. Event Result or Conclusion 1. Thompson runs electricity through a cathode ray tube from which most of the air was removed. 2. Thompson places charged plates on either side of the tube. Conclusion: 3. Identical rays made of tiny particles are produced regardless of the type of metal in the electrode. Conclusion: 4. Thompson proposes a new model of the atom. Thompson s model: Understanding the Atom 89
4 Rutherford Discovering the Nucleus Sequence the discovery of the nucleus and the development of Rutherford s atomic model. Event 1. Experiment to test Thompson s atomic model Description 2. Result of the gold foil experiment 3. Conclusion 4. Description of the dense, positive mass 5. New model of the atom 6. Results of further research Discovering Neutrons Describe Chadwick s addition to Rutherford s atomic model. Bohr s Atomic Model Contrast Bohr s model of the atom with Rutherford s model. Rutherford Electrons travel in empty space around the nucleus. Bohr
5 Diagram and label electron energy levels in Bohr s model. The Modern Atomic Model Contrast the location of electrons in the modern atomic model with their placement in Bohr s atomic model. Bohr Electrons move around the nucleus in circular orbits at different energy levels. Modern Quarks Identify 6 types of quarks Review
6 7 th Grade Science UNIT 1: Properties of Matter Name Date: Lesson 9 Independent Practice & HW Discovering Parts of an Atom Key Concept What is an atom? Directions: Label this diagram by writing the correct term from the word bank on each line. electron cloud neutron nucleus proton Directions: Answer each question or respond to each statement on the lines provided. 5. Early Greeks, such as Aristotle, thought all matter was made of which four elements? 6. How do modern scientists describe the makeup of matter? 7. Define atom. 8. Identify the parts of an atom.
7 Discovering Parts of an Atom Key Concept How has the atomic model changed over time? Directions: Place the events in chronological order from earliest to most recent by writing a number 1 through 7 on the line before the statement that describes each event. J.J. Thomson investigates the electrical charges of atoms. Democritus challenges the popular idea that matter is made of fire, water, air, and earth. Niels Bohr investigates the energy level of electrons. Students of Ernest Rutherford conduct the gold foil experiment. John Dalton finds evidence to support the theory that all matter is made of atoms that cannot be divided, created, or destroyed. Scientists discover that protons and neutrons are made of quarks. James Chadwick discovers that in addition to protons, the nucleus also contains neutrons. Directions: Answer each question on the lines provided. 8. Where are electrons found in the modern atomic model? 9. Do you think that the modern atomic model will change in the future? Explain.
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