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Unformatted text preview: Workshop #3 Chem 1A Fall 2010 1. The element is used extensively in the semiconductor industry. a) Provide the quantum number (n, l, ml, ms) for each electron in the n=3 shell; b) give the shape of these orbitals; c) give the relative energies of these orbitals. 2. Using the de Broglie equation ( , m = mass, u = velocity) calculate the wavelength of a) a fastball (baseball = 149 g) thrown @ 43.809 m/s; b) an electron of mass 9.11•10-31 kg moving at 1.89•107 m/s. Calculate the kinetic energy of each particle (KE = ). 3. Write the full ground state electron configuration for each of the elements represented by each of following atomic numbers. Z 19 Electron Configuration 24 25 What are the elements above? 4. Nitrogen, N2, requires an enormous amount of energy to break the triple bond joining the two nitrogen atoms, 945.3 kJ/mol. How much energy does it take to break the triple bond in a single molecule of N2? Calculate the wavelength and frequency of a photon powerful enough to break the N2 triple bond. 5. Match the scientist or principle with following descriptions a. Hund 1. Developed the equation to describe the quantum properties b. Schrödinger of an atom. 2. No 2 electrons can have same c. Pauli four quantum numbers 3. d. Aufbau 4. Electron configurations are most stable when unpaired electrons e. Heisenberg have parallel spins 5. As protons are added to the nucleus, electrons are added to the lowest energy atomic orbitals Conversion Factors and Constants ( 1 GHz = 1 x 103 MHz = 1 x 109 Hz Plancks constant = h = 6.63•10-34 J•s ) () speed of light = c = 3.00 x 108 m/s 1 J = 1 kg•m2•s-2 electron mass = 9.11 x 10 -31 kg Rydberg constant = RH = 2.18•10-18 J ...
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