Given 4,0,2,+1/2, indicate why this set of quantum numbers could not occur
I am unsure why this quantum number cannot occur, it's first quantum number value is understandable, 2nd quantum number is as well,and its spin is correct
please help
N = 4 is the main orbit and is OK.
l = 0 is OK since it can be 0,1,2,3 but no higher than N-1.
ml can be +l to - l in steps of 1 (including zero) so it can be 0 only. Can't be 1 or 2
The +1/2 is OK