CHEM101 Lecture Notes - Lecture 3: Rydberg Formula, Rydberg Constant, Bohr Model
LEC. 03
ATOMIC SPECTRA:
light is emitted when an element is vaporized and then excited electrically
white light passes through a prism = continuous spectrum (rainbow)
pass radiation through a slit and refracted by prism = discontinuous spectrum / line spectrum
oline spectrum: a series of fine lines separated by black spaces
IMPORTANT OBSERVATIONS:
oAtomic spectra are continuous
oEach element produced a distinct spectrum
Spectral lines are produced when an electron moves from one energy level to another energy
level
If energy cold take continuous values, the spectrum would be similar to the visible spectrum
Energy level in an atom are NOT CONTINUOUS but are discrete (quantized)
Absorption: the excitation from a lower allowed energy level to a higher allowed energy level
Emission: the relaxation from a higher allowed energy level to a lower allowed energy level
The Rydberg Equation:
Developed a relationship that predicted the position and wavelength of any line in a given
series
Rydberg Equation:
is the wavelength of the line
n1 and n2 are positive integers with n2 > n1
R = the Rydberg Constant (1.096776 x 107 m-1)
The Bohr Model of the Hydrogen Atom:
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Document Summary
Atomic spectra: light is emitted when an element is vaporized and then excited electrically. White light passes through a prism = continuous spectrum (rainbow) pass radiation through a slit and refracted by prism = discontinuous spectrum / line spectrum: line spectrum: a series of fine lines separated by black spaces. Important observations: atomic spectra are continuous, each element produced a distinct spectrum. Spectral lines are produced when an electron moves from one energy level to another energy level. If energy cold take continuous values, the spectrum would be similar to the visible spectrum. Energy level in an atom are not continuous but are discrete (quantized) Absorption: the excitation from a lower allowed energy level to a higher allowed energy level. Emission: the relaxation from a higher allowed energy level to a lower allowed energy level. Developed a relationship that predicted the position and wavelength of any line in a given series.