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I Spin number of molecules

  1. Mar 23, 2016 #1
    How does one go about finding the spin number for a molecule like water for example? Do we consider the spin of the nuclei (e.g. proton, neutrons), and also look at which electrons are shared and not?
     
  2. jcsd
  3. Mar 23, 2016 #2

    DrClaude

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    Staff: Mentor

    One usually considers only the total spin of the electrons, which is what is relevant spectroscopically. The spin of the nuclei might be relevant in some cases, but I have never seen the total spin of a molecule, or an atom for that matter.

    The spin of the individual protons and neutrons is not relevant,only the total spin of the nuclei.
     
  4. Mar 23, 2016 #3
    Oh really? So if considering MRI for example, doesn't the energy of molecules in the person's body depend on the entire spin of the molecule under influence from the magnetic field?
     
  5. Mar 23, 2016 #4

    DrClaude

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    Staff: Mentor

    No, MRI probes individual nuclear spins.
     
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