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The relationship between atomic energy transitions and the resulting emission and absorption of photons in the ultraviolet and visible regions of the electromagnetic spectrum. Topics include the effects of frequency and wavelength changes on atomic energy levels, the role of the ground state atom, and the significance of the principal quantum number (n) and orbital angular momentum quantum number (l) in determining permissible energy levels and electron configurations.
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CHM 115 E & G Ch. 7
c
56 x 106 km x 103 m 1 km
This is just at the extreme red end of the visible spectrum.
n 2 u
n 2 l
Eph
This wavelength is in the UV portion of the EM spectrum.
h mv
h mv
(This is much, much smaller than the diameter of an atom)
n (^) u^2
n (^) l^2
hc
n 2 u
n 2 l
hc
This occurs in the ultraviolet region of the spectrum.
1 kJ x 1 mol
hc
hc
m s