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Electronic Structure of Atoms

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Chapter 6.1-6.3 Electronic Structure of Atoms Electromagnetic Radiation Radio MW IR Visible UV X-ray -ray Wave R-O ... – PowerPoint PPT presentation

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Title: Electronic Structure of Atoms


1
Chapter 6.1-6.3
  • Electronic Structure of Atoms

2
Electromagnetic Radiation
  • Radio MW IR Visible UV
    X-ray ?-ray
  • Wave
  • R-O-Y-G-B-I-V
  • Wavelength (?) decreases
  • Frequency (?) increases
  • Velocity of radiation (c) 3.00 x 108 m/s
  • Note Velocity of radiation is fixed.

3
Electromagnetic Radiation
  • Frequency (?) wavelengths/s

c ? ?
4
(No Transcript)
5
Plancks Theory
  • Energy is emitted or absorbed in whole-number
    multiples of h?
  • h 6.63 x 10-34 Js, 1 J 1 kg m2/s2
  • ? Frequency of radiation
  • Allowed 1 h?, 2 h?, 3 h?, etc.
  • NOT allowed 1.5 h?, 2.3 h?, 3.3 h?, etc.
  • Quantized energy!
  • Not continuous!

6
Photoelectric Effect
  • Energy of ejected electrons depends upon
    frequency of radiation.
  • Einstein explains by assuming radiation to be
    made up of photons (tiny particles).
  • Ephoton h?
  • h 6.63 x 10-34 Js
  • ? Frequency
  • Problem 10,23 Pg. 252-253
  • Hint c ? ?

7
Predict outcome
  • Note A.) is glued
  • onto the surface.
  • Binding energy (BE)
  • Will A.) be ejected in I or II?
  • No (I), yes (II)
  • If ejected, how much energy will it carry?
    (assume complete energy transfer)
  • 2 J (in II) 10 J 8 J

8
Predict outcome
  • In II, the energy of ejected A.) is
  • Ekinetic 10 J 8 J 2 J
  • Energy of BE of A.)
  • striking B.)

Ekinetic Ephoton BE Or h? -
BE (kinetic energy of ejected e-)
9
  • Problem 6.26, Pg. 253
  • Continuous Spectrum ? R-O-Y-G-B-I-V
  • Line Spectrum ? Spectrum containing specific
    wavelengths.

10
Bohrs Model
  • Explains line spectrum
  • Ei (initial energy) ? 6 (level 2)
  • Ef (final energy) ? 10 (level 3)
  • Change in energy
  • (absorbed by e-)
  • ? E 10 6 Ef Ei 4
  • Absorbed or given off?
  • Absorbed

11
Bohrs Model
  • What will happen if e- jumps from level 3 ? 2?
    Ef 6, Ei 10
  • ? E Ef Ei 6 10
  • -4, abs or given off?
  • Given off

Bohrs Ei -RH (1/ni2) n 1,2,3,
etc. Ef -RH (1/nf2) RH Rydbergs
constant 2.18 x 1018 J
12
Bohrs Model
  • ? E Ef Ei
  • ? E RH (1/ni2 - 1/nf2)
  • Use this expression in solving problems in which
    e- jumps from level ni ? nf.
  • Problems 33, 39 Pg. 254

h? ? E RH (1/ni2 - 1/nf2) hc/?
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