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Electromagnetic Radiation and Energy

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Electromagnetic Radiation and Energy Electromagnetic Radiation: Energy traveling through space Three Characteristics of Waves: Wavelength: (symbolized l) – PowerPoint PPT presentation

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Title: Electromagnetic Radiation and Energy


1
Electromagnetic Radiation and Energy
  • Electromagnetic Radiation
  • Energy traveling through space
  • Three Characteristics of Waves
  • Wavelength (symbolized l)
  • Distance between two consecutive peaks or troughs
    in a wave
  • Frequency (symbolized n)
  • How many waves pass a given point per second
  • Speed (symbolized c)
  • How fast a given peak moves through space

2
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3
Electromagnetic Radiation and Energy
  • c ? x ?
  • c speed of particle
  • speed of light 2.9979 x 108 m/s
  • ? frequency (s-1 or Hz)
  • ? wavelength (m)

4
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5
  • As temperature increases
  • Maximum energy released in visible spectrum goes
    towards UV
  • white hot

6
Einsteins Photon
  • Photoelectric effect
  • Electron ejection after light strikes metal
    surface
  • Must be the right frequency
  • Used in automatic door openers
  • Einstein
  • Light has particle-like properties
  • Photons
  • No longer viewed as purely a wave

7
Spectra
  • Sunlight yields continuous spectrum
  • Energized gaseous elements yield certain
    wavelengths
  • Line emission spectrum

8
Atomic orbital
  • The probability function that defines the
    distribution of electron density in space around
    the atomic nucleus.

9
The s-orbital
  • The simplest orbital
  • The only orbital in the s-subshell
  • Occurs in every principal energy level
  • s stands for sharp
  • The first energy level only houses this orbital
  • Can house up to 2 electrons

10
The p-orbitals
  • Start in second principle energy level (n2)
  • There are three p-orbitals in the p-subshell (see
    below)
  • And one s-orbital
  • p stands for principle
  • Can house up to 6 electrons
  • 2px 2py 2pz

11
The d-orbitals
  • Start in third principle energy level (n3)
  • There are five d-orbitals in the d-subshell
  • And one s-orbital
  • And three p-orbitals
  • Can house up to 10 electrons
  • d stands for diffuse
  • 3dyz 3dxz
    3dxy 3dx2-y2 3dz2

12
The f-orbitals
  • Start in fourth principle energy level (n4)
  • There are seven f-orbitals in the f-subshell
  • And one s-orbital
  • And three p-orbitals
  • And five d-orbitals
  • Can house up to 14 electrons
  • f stands for fundamental

13
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14
Electron Configuration
  • Explain reactivity (or lack thereof) of elements
  • Explains order of placement in Periodic Table
  • Into groups or families
  • Similar chemical physical properties

15
Using the Periodic Table to advantage
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