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atomic-structure - Electronic structure Background basic...

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Electronic structure
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Background: basic structure 6.1: Review (do not have to know details) - shows evidence for the basic atomic model Sub-atomic particles include: Protons (p + ), neutrons (n ° ) and electrons (e ) n ° : neutral, massive, in nucleus, e : -ve, small mass, orbits, p + : +ve, massive, in nucleus Nucleus is small compared to size of atom p+ p+ e e Helium atom is shown
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Background: basic structure Previous slide was a single atom Let’s look at a compound: Cl Na Notice that the nuclei are far apart In other words, it’s the electrons that are important in bond formation
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Background: Movie See movie (0 - 10) 0 - 7: as above 7 - 10: Rutherfords model is in trouble: an “accelerated charge” should fall into nucleus Bohr revised Rutherford’s model to explain the existance of line spectra for elements… See Fig 6.10 (pg. 192) or refer to demo (spectroscopes act like prisms to separate light into its component colours)
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Movie: electron orbits See movie 10 - 20 10 - 14: Bohr suggests that electrons can only exist in certain orbits
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Movie: line spectra 14 -16: Line spectrum result from the release of photons as electrons fall back to lower orbit
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