chem chapter 7_1

chem chapter 7_1 - Chapter 7 part I Atomic structure What...

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Chapter 7 part I Atomic structure
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What do we know about atoms? Made up of protons, neutrons and electrons Proto n Electron Nucleus Neutron Protons and neutrons sit in the nucleus Electrons are dispersed around the nucleus in “orbitals” We model these orbital as discreet energy levels/shells. The electrons then sit inside these shells.
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Atomic Structure What is the nature of matter? Matter is made up of atoms What is the nature of at atom?
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Atomic Structure and Periodicity In the 19 th century it was believed that matter and energy are 2 separate and distinct entities Matter is made up of particles Particles have both mass and position (take up space) Energy as form of light is made up of waves The position of a wave could not be specified escription of the behavior of Matter and Energy at the atomic and subatomic level – quantum mechanics
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Electromagnetic Radiation What types of EM Radiation do we know? One of the ways that energy travels through space ELECTROMAGNETIC RADIATION Ultraviolet (UV) Light: . Infrared (IR) Micro waves X rays ALL exhibit the same type of wavelike behavior and travel at speed of light
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Characterization of Light Waves λ λ Time 1. Wavelength ( λ ): Length of 1 full wave. Distance between 2 consecutive troughs or peaks in a wave
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Characterization of Light Waves 2. Frequency ( ν ): Number of waves that pass a given point per second Time ν = 2 cycles/sec 1 second ν = 3 cycles/sec If the wavelength changes, so does the frequency
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Characterization of Light Waves Time 3. Amplitude ( ν ): Height of the wave as defined by a trough or a peak Intensity = (amplitude) 2
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Characterization of Light Waves 4. Speed of a wave (c): The speed of all light waves is 3 x 10 8 m/s (186,000 mi/hr) This is CONSTANT c = λν
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The nature of waves Wavelength ( λ ) Frequency ( ν ) Amplitude (A) 1 Hertz (Hz) = 1 cycle/sec 1/s or s -1 Speed of a wave (c): c = λν Λ is inversely proportional to V
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