Final answer:
The not allowed quantum number ml=+2 in the set n=3, l=3, and ml=+2 should be replaced with ml=0.
Step-by-step explanation:
The set of quantum numbers mentioned in option a, n=3, l=3, and ml=+2, contains one quantum number that is not allowed, which is ml=+2. The ml quantum number represents the magnetic quantum number and it specifies the orientation of the orbital in space. The ml value must range from -l to +l, so for l=3, the allowed values of ml would be -3,-2,-1,0,1,2,3. Therefore, to replace the quantum number that is not allowed, we can use any value of ml from the allowed range, such as ml=0 or ml=1.
Thus, the correct replacement for the not allowed quantum number ml=+2 in the set n=3, l=3, and ml=+2 is ml=0 (option a).