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Chemistry 121 Some Quantum Considerations II November 22, 2006 1. Discuss the photoelectric effect. 2. Discuss quantum numbers. Oregon State University Dr. Richard L Nafshun Which of the following sets of quantum numbers is not valid? (A) (B) (C) (D) (E) n = 1, l = 0, ml = 0, ms = +½. n = 3, l = 1, ml = 0, ms = +½. n = 3, l = 2, ml = -2, ms = -½. n = 2, l = 1, ml = 0, ms = +½. n = 1, l = 1, ml = 1, ms = +½. Discuss the statement, "Solutions to the wave equation for the hydrogen atom solved by Schrödinger led to the new concept of the quantization of energy and space for the electron?" Suggest a set of four quantum numbers describes the orbital pictured below? 3. Discuss the statement, "deBroglie’s proposition regarding the nature of matter was all matter exhibits a wavelength: λ = h/mv." 4. What is the wavelength of a 145 gram baseball traveling at 40 m/s (near 90 mph)? 5. How many unpaired electrons in a ground-state (A) oxygen atom, (B) nitrogen atom, (C) oxide ion, (D) fluoride ion, (E) calcium atom, (F) calcium ion, (G) silver ion? 6. Determine the ground-state electron configuration of a (A) nitrogen atom, (B) nitrogen ion, (C) aluminum ion, (D) silver ion. 7. Consider a carbon atom in the ground-state. Which of the following statements is false? (A) The carbon atom has 6 electrons; 2 are core electrons and 4 are valence electrons. (B) The valence electrons in the carbon atom are all located in 2p orbitals. (C) The core electrons in the carbon atom are all located in the 1s orbital. (D) There are two unpaired electrons in the carbon atom. (E) The carbon atom is paramagnetic. 8. Sketch a 2s orbital and a 3s orbital side by side, with correct relative scale. Sketch a 2s orbital and a 4p orbital side by side, with correct relative scale. 9. The magnetic quantum number (ml) relates to which of the following aspects of an orbital? Orientation, density, shape, size, spin. 10 The quantum number l relates to which of the following aspects of an orbital? Orientation, density, shape, size, spin. 11 The quantum number n relates to which of the following aspects of an orbital? Orientation, density, shape, size, spin. 12. Which orbital does not exist? 1s, 2p, 3p, 2d, 3d, 4p, 2s 13. Which of the following electron transitions in the hydrogen atom produces the photon with longest wavelength? n=6n=5 n=6n=4 n=6n=1 n=6n=3 n=6n=2 14. Which of the following sets of quantum numbers is not possible? (2, 1, 1, +½) (3, 1, 0, +½) (1, 0, 0, −½) (3, 2, −1, +½) (2, 2, 1, −½) 15. Which of the following statements is false? a. Longer wavelength radiation carries higher energies. b. Light can be considered to be made up of particles called photons. c. All material objects have some wave characteristics. d. Electrons can be viewed as standing waves in an atom. e. Bohr’s model of the hydrogen atom was based on classical physics.