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7 - Atomic Structure and Periodicity

7 - Atomic Structure and Periodicity - Atomic Structure and...

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Unformatted text preview: Atomic Structure and Periodicity Chemistry 7 th edition Chapter 7 Electromagnetic Radiation • Do you listen to the radio, watch TV, or use a microwave oven? Electromagnetic Radiation • Wavelength ( λ29 – Distance between two consecutive peaks or troughs in a wave • Frequency ( ν ) – Number of waves per second • Speed – All types of electromagnetic radiation travel at the speed of light Electromagnetic Radiation λ α 1 /ν λ ν = c λ in meters ν in s-1 Hertz (Hz) c = 3.00 x 10 8 m/s Example • The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? Example • The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? λ ν = c Example • The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? λ ν = c ν = c λ Example • The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? ν = c ν = 3.00 x 10 8 m/s λ 522 nm (1 x 10-9 m ) 1 nm Example • The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? ν = c ν = 3.00 x 10 8 m/s λ 522 nm (1 x 10-9 m ) 1 nm ν = 5.75 x 10 14 /s or 5.75 x 10 14 Hz History • Max Planck Energy is gained or lost in whole- number multiples ∆ E = nh ν • n = 1, 2, 3, … • h = 6.626 x 10-34 J · s Planck’s constant • v = frequency History • Albert Einstein E photon = h ν Photoelectric Effect Electrons emitted from matter E = h ν History • Albert Einstein E = hv KE = 1/2m υ 2 = h ν – h ν E = mc 2 History • Albert Einstein E = h ν KE = 1/2m υ 2 = h ν – h ν E = mc 2 m = E c 2 History • Albert Einstein E = mc 2 m = E E photon = hc c 2 λ m = E = hc / λ = h c 2 c 2 λ c Wavelength Calculation • Calculate the energy (in joules) of a photon of wavelength 5.00 x 10 4 nm. Wavelength Calculation • Calculate the energy (in joules) of a photon of wavelength 5.00 x 10 4 nm....
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7 - Atomic Structure and Periodicity - Atomic Structure and...

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