Review_Chapter7-9

Review_Chapter7-9 - Electrons in Atoms and Molecules...

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1 Electrons in Atoms and Molecules Chapter 7: H atom (single-electron atom) History • Cathode ray particles are electrons. • J.J. Thomson measured the m / e ratio. • Millikan’s oil-drop experiment gave the charge of an electron. • Rutherford proposed the nuclear model of the atom based on the scattering experiment. Light Wave-particle duality Wave property νλ = c Particle property Photon energy E = hv Bohr’s Hydrogen atom E n = –B/n 2 where B = 2.179 × 10 –18 J n is an integer, 1, 2, 3, … Δ E = E f E i Electron transition = Δ E hv + : absorption of radiation – : emission of radiation 2 De Broglie’s wavelength of microscopic particles v m h = λ Quantum Numbers and Atomic Orbitals • Wave functions require the assignment of three quantum numbers: n , l , and m l. • Wave functions with acceptable values of the three quantum numbers are called atomic orbitals Shapes associated with orbitals depend on the value of l . Thus, an s orbital ( l = 0) is spherical and a
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This note was uploaded on 05/06/2008 for the course CHEM 103 taught by Professor Forgot during the Spring '07 term at CUNY City.

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Review_Chapter7-9 - Electrons in Atoms and Molecules...

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