The allowable combination for the atomic orbital is n=4, l=2, [tex]m_{l}[/tex]=2.
Three quantum numbers specify an atomic orbital:
- The principal quantum number, n, which is a positive integer, describes the relative size of the orbital and its distance from the nucleus.
- l is the angular momentum quantum number that is related to the shape of the orbital; l is an integer from 0 to n-1 (so n limits l ),
- [tex]$\boldsymbol{m}_{l}$[/tex] is the magnetic quantum number that prescribes the three-dimensional shape of the orbital around the nucleus; [tex]m_{l}[/tex] values are integers from -l to =l(l limits ml)
For n = 4, l can four values: 0, 1, 2, and 3. To be consistent with [tex]m_{l}[/tex]=+2the l value must be higher than 1. There are two l values that are consistent with n and [tex]m_{l}[/tex] values: l= 2 or 3
Therefore, the allowable condition is n=4, l=2, [tex]m_{l}[/tex]=2
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