Question

What is spin multiplicity and total spin for Fe and Cr?

Answer 1

Answer:

The number of possible orientations, calculated as 2 S+12 S+1, of the spin 

angular momentum

 corresponding to a given total spin quantum number (SS), for the same spatial electronic wavefunction. A state of singlet multiplicity has S=0S=0 and 2 S+1=12 S+1=1. A 

doublet state

 has S=12S=12, 2 S+1=22 S+1=2, etc. Note that when S>LS>L (the total orbital 

angular momentum

 possible) there are only 2 L+12 L+1 orientations of total 

angular momentum

 possible.