FTP, name this concept, the angular momentum associated with microscopic particles, and synonymous with the motion you would associate with a top.
In Carbon 13 NMR, it is responsible for the splitting of resonance peaks, causing magnetic interactions between hydrogen atoms and carbon-13 isotopes.  Electrons can have a magnitude of it equal only to plus or minus Planck's constant divided by 4 times pi.  Electrons with the same kind of it are forbidden to share the same orbital, as defined by the Pauli exclusion principle.  FTP, name this concept, the angular momentum associated with microscopic particles, and synonymous with the motion you would associate with a top.
In Carbon 13 NMR, it is responsible for the splitting of resonance peaks, causing magnetic interactions between hydrogen atoms and carbon-13 isotopes.  
spin