Download Electrons in Atoms Section 5.1

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Section 5.1 Continued
Particle Nature of Light
• Compare the wave and particle models of
• Define a quantum of energy and explain
how it is related to an energy change of
• Contrast continuous electromagnetic
spectra and atomic emission spectra.
Particle Nature of Light
• Besides having wave characteristics, light also
acts like a particle.
• The Quantum Concept: Energy can only be
gained or lost in a specified amount  A
• Equantum = hv
• h is Plank’s Constant = 6.626 x 10-34 J•s
Blocks and Quanta
• Think of energy transfer like building a
wall of Legos®.
• I can only add or take away 1 Lego.
• There is no such thing as a ½ Lego.
Particle Nature of Light
• Photoelectric Effect: electrons, called
photoelectrons, are emitted from a metal’s
surface when light of a certain frequency
shines on the surface.
The Photon
• Photon:
– particle of electromagnetic radiation
– no mass
– carries a quantum of energy
• Ephoton = hv
Neon Signs
Atomic Emission Spectra
• Electricity passed through a tube of gas
• Gas atoms absorb energy and become excited
• Atoms release the energy absorbed in the form
of light.
• Each atom has specific frequencies it will
release in the light form.
Atomic Emission Spectra
Hydrogen (H)
Helium (He)
Oxygen (O)
Atomic Emission Spectra
Neon (Ne)
Xenon (Xe)
• 7-12 on page 126
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