Which Quantum Numbers never occur for ground state Se

Which Quantum Numbers never occur for ground state Se?
Using the notation n, l ml, ms, which of the following combinations of quantum numbers never occurs
for any electron in a ground state Se atom?
A) 4,2, +1, +1/2
B) 2,0,0, -1/2
C) 2,1,0,-1/2
D) 4; 1,0,-1/2
E) 3,2, -2, +1/2


Ok so we know that Se last valence e- is in the 4P8... first all of these look possible. I hazzard to guess that it is E...

When N=3 if L=2 (this would correspond to sub-shells D right?) So if/when N=3 there is no electron in the D shells???


I had another question like this a while ago and I keep getting confused by the statement L=N-1 because, as i ask above, yes its a correct seeries of numbers according to the little formula but it doesn't happen. So why on earth does that formula make it sound possible?

hello again .....how are you ??

A) is wrong

because as you said its valence electron configuration is 4s2 4p4......4p means n = 4 and l = 1

but A corresponds to 4d as l = 2 mens 4d subshell

E is correct Se has 3d electrons but no 4d

feel free to ask any questions