Quantum Mechanics Practice Test - Answer Key

 

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  1. Would light of wavelength (650 nm) be able to excite an electron in Be3+ from n=2 to n=6?

    No.

    2.  

     

  2. Determine the number of orbitals that can have the following designation

      3.  

    • n = 4

      16

      •  

    • n = 3     ml = 2

      1

      •  

    • 2p

      3

     

     

  3. How many electrons can have the following designation

      4.  

    • 3d        ml     ms = + ½

      1 electron

      •  

    • n = 6   ml = 2

      8 electrons

     

     

  4. Determine if the energy is absorbed or emitted when an electron transitions from the n=7 to the n=2 energy level of C5+ and the wavelength of the photon associated with the transition.

    Energy is emitted and has a wavelength of 11.0 nm

    5.  

     

  5. It takes 208.4 kJ of energy to remove 1 mole of electrons from the atoms on the surface of rubidium metal.  If rubidium metal is irradiated with 254-nm light, what is the maximum velocity of the released electron?

    v = 976114 m/s

    6.  

     

  6. Consider and atom traveling at 2.78 x 108 m/s.  The De Broglie wavelength is found to be 1.797 x 10-5 pm.  Which element is this?

    Bromine

    7.  

     

  7. What is the electron configuration for

      8.  

    • Fe2+:   [Ar]3d6

      •  

    • As2-:    [Ar]4s23d104p5

     

     

  8. Given:

    The figure below represents part of the emission spectrum for a one-electron ion in the gas phase.  All the lines result from the electronic transition to the n = 3 state.

      9.  

    • What electronic transition corresponds to lines A and B?

      A:        6       à 3

       

      B:        5       à 3

      •  

       

    • If the wavelength of line B is 142.5 nm, calculate the wavelength of line A.

      λ = 121.7 nm

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