I am struggling with an Atoms and Nuclei past paper question, if someone can help please. In a Stern Gerlach experiment, how many traces on the plate would be observed if instead of hydrogen a)helium b)boron (atomic number 5), are used? [Hint: Boron will exist in 2L-S coupled states] I have no idea how to approach this problem. The previous part of the question asked to calculate the gap between the traces observed on the plate which is well known to be two traces, same for silver and other electrons with one electron in the outershell. The two traces problem I would do, but not the one I've mentioned above. Can someone help?