student will learn: relationship between light & electrons what produces color electromagnetic...
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Student will learn:
Relationship between light & electrons
What produces color
Electromagnetic Spectrum Readings
Neils Bohr Model of Hydrogen Readings
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Atomic theory = Dalton
Electron discovery = JJ Thomson
Electron charge = Millikan
Nucleus discovery = Rutherford
Neutron = Chadwick
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Neils Bohr
What keeps the negative electrons from falling toward the positive nucleus?
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Neils BohrWhat keeps the negative electrons from falling
toward the positive nucleus?
The emission of light is related to the behavior
of the electrons.
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Light as a stream of photons
Tiny little packets of quantum energy
Light as a Wave
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Light: travels in waves, made up of photons
Photons : zero mass, contain a quantum energy
Glasses Light = electromagnetic radiation
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energy from light affects electrons
• Ground State: lowest energy state of an atom.
• Excited State: an atom has absorbed energy higher than ground state.
• Electromagnetic radiation: The energy given off when an excited
atom returns to its ground state.
“production of colored light / luster of a metal”
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Absorption / Emission of Photon
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An excited atom returns to a lower energy level.
Ground State
Excited State
Photon emitted
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The color of the photon emitted depends on the energy change that produces it.
Excited state one
Excited state two
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Each photon emitted corresponds to a particular energy change.
4 excited states… each one may emit a different color
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? What is the principal number of electrons that produces the 1094
infared wavelength?
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? A Red light is produced when the electrons fall back from energy level 3 to energy level_________.
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? A Violet light is produced when the electrons fall back from energy level __________ to energy level_________.
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? For hydrogen to produce a UV wavelength the electron must fall back from what to what?
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Student will learn:
Relationship between light & electrons
What produces color
Electromagnetic Spectrum Readings
Neils Bohr Model of Hydrogen Readings