🤓 Based on our data, we think this question is relevant for Professor Curtis' class at UNC.
We have to determine if one electron configuration of the two given configurations, will have a lower energy in the absence of an external magnetic field.
The two given electron configurations only differ in the spin of the electron in the 2s orbital.
Two possible electron configurations for an Li atom are shown here.
In the absence of an external magnetic field, can we say that one electron configuration has a lower energy than the other?