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The Structure Of The Atom

Home > PowerPoint Slides > The Structure Of The Atom
Published in: Chemistry
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Early ideas about matter (Dalton atomic theory) The sub particles of the atom Electrons in the atom

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  1. CHAPTER Chapter Outline Resources Section 4.2 Defining the Atom Objectives Define atom. Help Distinguish between the subatomic particles in terms of relative charge and mass. Describe the structure of the atom, including the locations of the subatomic particles. Review Vocabulary model: a visual, verbal, and/or mathematical explanation of data collected from many experiments 5
  2. CHAPTER Chapter Outline The Electron Resources Help When an electric charge is applied, a ray of radiation travels from the cathode to the anode, called a cathode ray. Cathode rays are a stream of particles carrying a negative charge. The particles carrying a negative charge are known as electrons. 5
  3. CHAPTER Chapter Outline The Nucleus (cont.) Resources Help Although most of the alpha particles went through the gold foil, a few of them bounced back, some at large angles. Lead block containing an alpha-particle- emitting source Alpha particle deflected at a large angle Most alpha particles pass through the foil with little or no deflection Beam of alpha particles Gold foil Zinc-sulfide- coated screen Alpha particle deflected at a small angle 5 oncepts In Motion Click here to view an animated version of this graphic.
  4. CHAPTER Chapter Outline The Nucleus (cont.) Resources Help The repulsive force between the positively charged nucleus and positive alpha particles caused the deflections. Electrons 9 Alpha particle path 9 Nucleus 5
  5. CHAPTER Chapter Outline The Nucleus (cont.) Resources Help Rutherford refined the model to include positively charged particles in the nucleus called protons. James Chadwick received the Nobel Prize in 1935 for discovering the existence of neutrons, neutral particles in the nucleus which accounts for the remainder of an atom's mass. 5

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