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**Modern Chemistry Chapter 4 Arrangement of Electrons in Atoms**

Sections 1-3 The Development of a New Atomic Model The Quantum Model of the Atom Electron Configurations

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**The Development of a New Atomic Model**

Section 1 The Development of a New Atomic Model Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Electromagnetic radiation Electromagnetic spectrum Wavelength Frequency Photoelectric effect Quantum Photon Ground State Excited state Line-emission spectrum Continuous spectrum Section 1 Vocabulary Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Properties of Light Electromagnetic Radiation: a form of energy that exhibits wavelike behavior as it travels through space. Wavelength: the distance between corresponding points on adjacent waves Frequency: the number of waves that pass a given point in a specific time. Chapter 4 Section 1 New Atomic Model pages

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**Wavelength and Frequency Image**

p. 98 Chapter 4 Section 1 New Atomic Model pages

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**Electromagnetic Spectrum Image**

Chapter 4 Section 1 New Atomic Model pages

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**Electromagnetic Spectrum Image**

Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Properties of Light wavelength x frequency = speed of light x = c Visible Light = R O Y G B I V Long Low Low E Short High High E Chapter 4 Section 1 New Atomic Model pages

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**The Photoelectric Effect**

Max Planck proposed that energy is proportional to the frequency of the electromagnetic wave. Electromagnetic energy is emitted from objects in small packages called quanta. E = h Planck’s constant h = x J•sec Chapter 4 Section 1 New Atomic Model pages

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**Quanitization of Energy Animation**

Chapter 4 Section 1 New Atomic Model pages

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**The Photoelectric Effect**

Albert Einstein expanded on Planck’s idea. Electromagnetic radiation has a dual wave-particle nature. A particle of light is a photon. Photon: a particle of electromagnetic radiation having zero mass and carrying a quantum of energy. Ephoton = h Chapter 4 Section 1 New Atomic Model pages

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**Energy of a Photon Animation**

Chapter 4 Section 1 New Atomic Model pages

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**The Photoelectric Effect**

The photoelectric effect refers to the emission of electrons from a metal when light shines on the metal. p. 99 Chapter 4 Section 1 New Atomic Model pages

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**Photoelectric Effect Animaiton**

Chapter 4 Section 1 New Atomic Model pages

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**The Photoelectric Effect**

To knock an electron loose, it must be hit with a photon which possesses a minimum amount of energy. This energy corresponds to its frequency. Different metals hold electrons more or less tightly So different metals require different frequencies to show the photoelectric effect. Chapter 4 Section 1 New Atomic Model pages

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**The H-Atom’s Line Emission Spectrum**

Electric current is passed through a vacuum tube with hydrogen in it. A glow is produced When shined through a prism a line emission spectrum is produced p. 101 Chapter 4 Section 1 New Atomic Model pages

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**Hydrogen’s Line Emission Spectrum**

Insert Glencoe Disk 1 Chapter 4 Section 1 New Atomic Model pages

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**Absorption and Emission Spectrum Animation**

Chapter 4 Section 1 New Atomic Model pages

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**Line Emission Spectrum**

Insert Glencoe Disk 1 Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Bohr Model of the Atom Niels Bohr proposed orbits for the electrons Each orbit has a fixed energy Lower energy orbits are closer to the nucleus Between orbits the electron cannot exist Chapter 4 Section 1 New Atomic Model pages

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**Explaining the Line Emission Spectrum**

An electron absorbs a specific amount of energy (absorption) and moves from its ground state to an excited state Chapter 4 Section 1 New Atomic Model pages

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**Explaining the Line Emission Spectrum**

The electron returns to its ground state and emits a photon (emission). Chapter 4 Section 1 New Atomic Model pages

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**Explaining the Line Emission Spectrum**

This photon has an energy corresponding to the difference between the two states. This photon has a specific E, , and color. Chapter 4 Section 1 New Atomic Model pages

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**Photon Emission and Absorption Image**

Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Bohr Model of the Atom Bohr’s calculated values for the lines agreed with the values observed for the lines in each series. However, it did not explain the spectra of atoms with more than one electron. Chapter 4 Section 1 New Atomic Model pages

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**Bohr Model of the Atom Animation**

Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Bohr and Einstein Chapter 4 Section 1 New Atomic Model pages

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**Chapter 4 Section 1 New Atomic Model pages 97-103**

Section 1 Homework Chapter 4 Section 1 New Atomic Model pages

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