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Teacher Prep
• Spectroscope
• Gas tubes
Revisiting Atomic Structure
What you know isn’t necessarily what it is.
LIGHT AND ATOMIC
STRUCTURE
LIGHT AND ATOMIC STRUCTURE
Spectroscope Activity
What do you see?
What do you think it means?
What is the source of what you observe?
Light & Atomic Structure
Visible light consists of electromagnetic (EM) waves
which our retina can detect and our brain can
interpret.
LIGHT AND ATOMIC STRUCTURE
Light & Atomic Structure
In a vacuum, all EM waves travel at the speed of
light.
c = l x f
c = speed of light = 3.00 x 108
m/s
l = wavelength in meters
f = frequency in Hertz (Hz = s-1
)
LIGHT AND ATOMIC STRUCTURE
Light & Atomic Structure
Each shade of colour is a result of a very specific
wavelength of light.
656 nm486 nm434 nm410 nm
LIGHT AND ATOMIC STRUCTURE
Light & Atomic Structure
Why do these lines appear?
The electrons of atoms prefer to remain at the
lowest energy level.
Draw the Bohr-Rutherford diagram of H.
What happens to the electron when it absorbs
energy?
LIGHT AND ATOMIC STRUCTURE
H
Light & Atomic Structure
What happens to the electron when it absorbs
energy?
LIGHT AND ATOMIC STRUCTURE
H
ENERGY
Electrons move to higher energy levels when excited.
Electrons drop to a lower energy level and release energy.
ENERGY
Light & Atomic Structure
Light in the visible spectrum
is only observed when
electrons drop from a
specific high range of
energy levels to a
specific low range of
energy levels.
Due to different electron
configurations, each
element has a different
emission spectrum.
LIGHT AND ATOMIC STRUCTURE
Light & Atomic Structure
LIGHT AND ATOMIC STRUCTURE
Light & Atomic Structure
Atoms will only absorb specific amounts of energy
(photon). Electrons must always be located at a
defined energy level, not in between.
E = h x f OR E = h x n
E = energy in Joules
h = Planck’s constant = 6.6262 x 10-34
J•s
f (n)= frequency in Hertz (Hz = s-1
)
LIGHT AND ATOMIC STRUCTURE
Summary
LIGHT AND ATOMIC STRUCTURE
Another symbol for frequency
Ground state
E1
E2
E3
E4
E5
Energy levels
continue to
get closer
until they
finally
converge at . . . . . E∞
THE HYDROGEN ATOM
NUCLEUS
ELECTRON
The “Ground State” is the lowest energy level available to the
electron. Other energy levels may be added as follows:
LIGHT AND ATOMIC STRUCTURE
2.4 2.6 2.8 3.0 3.2
Frequency/ 1015
Hz
EMISSION
LINE
SPECTRUM
As the electron falls
from higher to lower
energy level, E2 to E1,
a photon of light is
emitted with
frequency, f, given by
the equation E = h x f
1
2
3
4
5
LIGHT AND ATOMIC STRUCTURE
2.4 2.6 2.8 3.0 3.2
Frequency/ 1015
Hz
EMISSION
LINE
SPECTRUM
LIGHT AND ATOMIC STRUCTURE
2.4 2.6 2.8 3.0 3.2
Frequency/ 1015
Hz
EMISSION
LINE
SPECTRUM
LIGHT AND ATOMIC STRUCTURE
Frequency/ 1015
Hz
2.4 2.6 2.8 3.0 3.2
EMISSION
LINE
SPECTRUM
LIGHT AND ATOMIC STRUCTURE

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Tang 01 light and atomic structure

  • 2. Revisiting Atomic Structure What you know isn’t necessarily what it is.
  • 4. LIGHT AND ATOMIC STRUCTURE Spectroscope Activity What do you see? What do you think it means? What is the source of what you observe?
  • 5. Light & Atomic Structure Visible light consists of electromagnetic (EM) waves which our retina can detect and our brain can interpret. LIGHT AND ATOMIC STRUCTURE
  • 6. Light & Atomic Structure In a vacuum, all EM waves travel at the speed of light. c = l x f c = speed of light = 3.00 x 108 m/s l = wavelength in meters f = frequency in Hertz (Hz = s-1 ) LIGHT AND ATOMIC STRUCTURE
  • 7. Light & Atomic Structure Each shade of colour is a result of a very specific wavelength of light. 656 nm486 nm434 nm410 nm LIGHT AND ATOMIC STRUCTURE
  • 8. Light & Atomic Structure Why do these lines appear? The electrons of atoms prefer to remain at the lowest energy level. Draw the Bohr-Rutherford diagram of H. What happens to the electron when it absorbs energy? LIGHT AND ATOMIC STRUCTURE H
  • 9. Light & Atomic Structure What happens to the electron when it absorbs energy? LIGHT AND ATOMIC STRUCTURE H ENERGY Electrons move to higher energy levels when excited. Electrons drop to a lower energy level and release energy. ENERGY
  • 10. Light & Atomic Structure Light in the visible spectrum is only observed when electrons drop from a specific high range of energy levels to a specific low range of energy levels. Due to different electron configurations, each element has a different emission spectrum. LIGHT AND ATOMIC STRUCTURE
  • 11. Light & Atomic Structure LIGHT AND ATOMIC STRUCTURE
  • 12. Light & Atomic Structure Atoms will only absorb specific amounts of energy (photon). Electrons must always be located at a defined energy level, not in between. E = h x f OR E = h x n E = energy in Joules h = Planck’s constant = 6.6262 x 10-34 J•s f (n)= frequency in Hertz (Hz = s-1 ) LIGHT AND ATOMIC STRUCTURE
  • 13. Summary LIGHT AND ATOMIC STRUCTURE Another symbol for frequency
  • 14. Ground state E1 E2 E3 E4 E5 Energy levels continue to get closer until they finally converge at . . . . . E∞ THE HYDROGEN ATOM NUCLEUS ELECTRON The “Ground State” is the lowest energy level available to the electron. Other energy levels may be added as follows: LIGHT AND ATOMIC STRUCTURE
  • 15. 2.4 2.6 2.8 3.0 3.2 Frequency/ 1015 Hz EMISSION LINE SPECTRUM As the electron falls from higher to lower energy level, E2 to E1, a photon of light is emitted with frequency, f, given by the equation E = h x f 1 2 3 4 5 LIGHT AND ATOMIC STRUCTURE
  • 16. 2.4 2.6 2.8 3.0 3.2 Frequency/ 1015 Hz EMISSION LINE SPECTRUM LIGHT AND ATOMIC STRUCTURE
  • 17. 2.4 2.6 2.8 3.0 3.2 Frequency/ 1015 Hz EMISSION LINE SPECTRUM LIGHT AND ATOMIC STRUCTURE
  • 18. Frequency/ 1015 Hz 2.4 2.6 2.8 3.0 3.2 EMISSION LINE SPECTRUM LIGHT AND ATOMIC STRUCTURE