Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific...
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Transcript of Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific...
![Page 1: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/1.jpg)
Evidence of Energy Levels
![Page 2: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/2.jpg)
e-e- Ground state
Excited state
Electrons can only be atspecific energy levels,NOT between levels.
![Page 3: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/3.jpg)
Energy Level
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 329
AA
BB
CC
DD
Ground state
En
erg
y
Fourexcitedstates
![Page 4: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/4.jpg)
Color = Energy of Photons
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 329
![Page 5: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/5.jpg)
Spectroscopy
• The science of analyzing matter using electromagnetic emission or absorption spectra.
• Used in many fields of science such as astronomy or forensics.
![Page 6: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/6.jpg)
Atomic Emission Spectrum• A characteristic set of colored lines that is
unique for each element (“fingerprint”)– Different # of electrons
• Caused by the electrons releasing energy as they go from the excited state back down to the ground state– Each line corresponds to a specific photon of
light being emitted
![Page 7: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/7.jpg)
Excited vs. Ground State• Ground State: the lowest possible energy
of an atom described by quantum mechanics
• Excited State: electrons jump to higher energy levels due to an input of energy– It takes a quantum of energy to jump electron
to the next higher energy level– Quantum = amt. of energy needed to move an
e- from one energy level to the next
![Page 8: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/8.jpg)
#7
• When energy is added to an atom, it causes the electrons to jump up to higher energy levels (become “excited”). They release energy when they return to the ground state.
![Page 9: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/9.jpg)
An Excited Lithium Atom
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 326
Photon ofred lightemitted
Li atom inlower energy state
Excited Li atom
Ene
rgy
![Page 10: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/10.jpg)
Excitation of Hydrogen Atoms
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 328
![Page 11: Evidence of Energy Levels. e-e- e-e- Ground state Excited state Electrons can only be at specific energy levels, NOT between levels.](https://reader034.fdocuments.in/reader034/viewer/2022051115/5697bf9e1a28abf838c9493d/html5/thumbnails/11.jpg)
Return to Ground State
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Frequency A
Frequency B
Frequency C
n = 2
n = 1
n = 3
A
B
C
A + B = C