Exercises

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
Calculate the energy (a) in eV Answer and (b) in joules for the sixth energy level (n = 6) of a hydrogen atom.
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.)
What frequency of light is emitted when an electron in a hydrogen atom jumps from n = 6 to n = 2? Answer
How much energy is needed to completely remove the electron from a hydrogen atom in the ground state? Answer
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
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
Using any reference you wish, write the complete electron configurations for (a) boron Answer, (b) aluminum Answer, and (c) potassium. Answer
Explain how you know that you have the correct total number of electrons in your answers for 8a Answer, 8b Answer, and 8c. Answer
Refer to Figure 9.21 only, and write the complete electron configurations for (a) argon Answer, (b) zinc Answer, and (c) bromine. Answer

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