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Physical Science, 5/e
Bill Tillery, Arizona State University

Atomic Structure

Exercises

  1. A neutron with a mass of 1.68 x 10-27 kg moves from a nuclear reactor with a velocity of 3.22 x 103 m/s. What is the de Broglie wavelength of the neutron? Answer
  2. Calculate the energy (a) in eV Answer and (b) in joules for the sixth energy level (n = 6) of a hydrogen atom.
  3. How much energy is needed to move an electron in a hydrogen atom from n = 2 to n = 6? Give the answer (a) in joules Answer and (b) Answer in eV. (See Figure 9.14 for needed values.)
  4. What frequency of light is emitted when an electron in a hydrogen atom jumps from n = 6 to n = 2? Answer
  5. How much energy is needed to completely remove the electron from a hydrogen atom in the ground state? Answer
  6. Thomson determined the charge-to-mass ratio of the electron to be -1.76 x 1011 coulomb/kilogram. Millikan determined the charge on the electron to be -1.60 x 10-19 coulomb. According to these findings, what is the mass of an electron? Answer
  7. Assume that an electron wave making a standing wave in a hydrogen atom has a wavelength of 1.67 x 10-10 m. Considering the mass of an electron to be 9.11 x 10-31 kg, use the de Broglie equation to calculate the velocity of an electron in this orbit. Answer
  8. Using any reference you wish, write the complete electron configurations for (a) boron Answer, (b) aluminum Answer, and (c) potassium. Answer
  9. Explain how you know that you have the correct total number of electrons in your answers for 8a Answer, 8b Answer, and 8c. Answer
  10. Refer to Figure 9.21 only, and write the complete electron configurations for (a) argon Answer, (b) zinc Answer, and (c) bromine. Answer