Chapter 7: Quantum Mechanical Model of Atom

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Chapter 7 Quantum Mechanical Model of Atom

• CHE 123 General Chemistry I
• Dr. Jerome Williams, Ph.D.
• Saint Leo University

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Overview

• Development of Periodic Table
• Light Electromagnetic Radiation
• Matter Energy

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Development of Periodic Table

• A Brief History of Periodic Table
• Lavoisier (First to Organize Known Elements)
• Dobreiner (Law of Triads)
• Newlands (Law of Octaves)
• Meyer vs. Mendeleev (Birth of Periodic Table)

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Development of Periodic Table
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Development of Periodic Table
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The Development of Periodic Table

• The periodic table is the most important
  organizing principle in chemistry.
• Chemical and physical properties of elements in
  the same group are similar.
• All chemical and physical properties vary in a
  periodic manner, hence the name periodic table.

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The Development of Periodic Table

• What is Periodicity?
• Properties of elements are similar occur at
  fixed intervals
• Used to predict trends in behavior
• Physical Chemical behavior based on electronic
  configuration (electron structure).

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Light Electromagnetic Radiation

• Matter exhibits properties that are consistent
  with waves.

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Light Electromagnetic Radiation

• Frequency (?, Greek nu) Number of peaks that
  pass a given point per unit time.
• Wavelength (?, Greek lambda) Distance from one
  wave peak to the next.
• Amplitude Height measured from the center of the
  wave. The square of the amplitude gives intensity.

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Light Electromagnetic Radiation

• Speed of a wave is the wavelength (in meters)
  multiplied by its frequency in reciprocal
  seconds.
• Wavelength x Frequency Speed
• ? (m) x ? (s1) c (m/s1)

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Light Electromagnetic Radiation
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Light Electromagnetic Radiation