atomic spectra. much of what we know about atomic structure comes from analysis of light either...
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Atomic Spectra
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Much of what we know about atomic structure comes from analysis of light either being emitted or absorbed by substances.
Elements can emit certain wavelengths (λ) when excited
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Most sources of radiant energy (ex. light bulbs) produce many different wavelengths of light (continuous spectrum).
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Elements produce certain colors when excited (via electrical discharge or heat).
H Ne
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When separated by a prism, the light produced by each element produces a specific spectrum of light (atomic spectrum).
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Spectral lines can determine the chemical composition of various materials or objects (ex. stars).
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Spectral lines can also tell us about star movement!!!
Moving towards equipment
Moving away from equipment
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What does the atomic spectrum of an element tell us?
Electrons (e-) are either emitting or absorbing energy by changing energy states.
n = 1
n = 2
n = 3
n = principal quantum #
# = Energy
- -
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Energy level concept based on the Bohr Model of the atom.
Electron
Proton Neutron
- e- are found in orbits of certain radii.
- e- in a particular orbit has a specific energy and does not radiate energy while in orbit.
- Energy is emitted or absorbed when an e- changes from one energy level to another.
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Types of electromagnetic (EM) radiation observed when e- change energy levels.