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Atomic Models and Quantum Numbers for handout shortened version new 4 slides per page

Atomic Models and Quantum Numbers for handout shortened version new 4 slides per page

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1/21/2014 1 Structure Correlation, Properties of the Atom Review: Atom Models Hard sphere model Electron cloud model Orbital model Plum-pudding model Electromagnetic Radiation Wavelength, λ distance from crest one wave to the crest of the next wave. units of distance e.g. m, cm, Å . 1 Å = 1 x 10 -10 m = 1 x 10 -8 cm Frequency, υ number of crests or troughs that pass a given point per time. units of 1 cycle/time 1 cycle per second –1 Hertz (Hz)
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1/21/2014 2 What is the frequency of green light of wavelength 5200 Å ? EM Radiation and Energy 1900 -Max Planck studied black body radiation and realized that to explain the energy spectrum he had to assume that: 1. energy is quantized 2. light has material (particle) characteristics NP 1918. On the Law of Distribution of Energy in the Normal Spectrum Contribution of 2 important scientists: Photoelectric Effect – displacement of e - by impinging light 1905 -explanation involved light having particle-like behavior. (LIGHT QUANTAor PHOTON) NP 1921.On a Heuristic Viewpoint Concerning the Production and Transformation of Light Atomic Absorption and Emission of Radiation As early as 1888, Johannes Rydbergobserved that a gas cloud consisting of atoms can absorb or emit light Full visible spectrum gas of atoms absorbs light gas of atoms emits light Atomic Spectra –Absorption of light Gaseous atoms can be shown to absorb light by using an absorption spectrum Absorption spectra indicate the wavelengths of light that have been absorbed . Atomic Absorption Spectroscopy Instrument
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1/21/2014 3 Atomic Spectra –Emission of light The same gaseous atoms can be shown to emit radiation based on the emission spectrum it forms. Flame test experiment Atomic Spectra and Rydberg Equation circle5 1880s -The Rydberg equation is an empirical equation that relates the wavelengths of the lines in the hydrogen spectrum. Emission spectra of hydrogen Atomic Spectra and the Bohr Atom EM as radiation with energy and has particle-like properties Photoelectric effect shows particle nature of light Atomic emission and absorption gives hint on the underlying structure of electrons in atoms Postulates of the BOHR ATOMIC MODEL: 1. An atom has a number of definite and discrete energy levels or orbitals in which an electron may exist without emitting or absorbing electromagnetic radiation.
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