I know that the U atom has four unpaired electrons. Therefore it has a total spin S of 2. This means its multiplicity is 2S+1 = 5. Now consider a complicated molecule such as $UF_6$. In theory all I need to do is calculate how many unpaired electrons exist and then for each un paired electron assign a value of 0.5 in order to get the toal spin S and then use the fact that the multiplicity is 2S +1. However when dealing with d and f block elements things get much trickier and I am unable to work the multiplicity out. Is there a straighforward way to determine the multiplicity of $UF_6$, or better still an online database that contains this information for many different molecules (as I would also like to eventually determine the multiplicities of Uranium and Tungsten oxides) .