An excited electron configuration for p? can place both electrons in the same p orbital (both in mi = 1 or 0, or -1). Explain why the Ms for this excited state electron configuration must be 0 using the vector model of atoms. Pay attention to the fact that unlike mi, Ms can always have only two values (and only two possible directions of arrow in an external magnetic field). 2p All possible ground state terms for d2 electron?