atomic theory = dalton electron discovery = jj thomson electron charge = millikan nucleus discovery...
TRANSCRIPT
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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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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 of atom.
• Excited State: atom absorbed energy higher than ground state.
• Electromagnetic radiation: energy given off when excited atom returns
to its ground state.
“production of colored light / luster of a metal”
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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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Excited neon atoms emit light when falling back to the ground state or to a lower-energy excited state.
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Show video: fireworks
Fireworks lab:
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? According to the Bohr’s Model for Hydrogen atom what is
principal number the electron that produces the 1875 infrared wavelength?
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? According to the Bohr’s Model…..produces a blue light when the electron fall back from energy level 4 to energy level_________.
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? For hydrogen to produce a UV wavelength the electron must fall back from what to what?