• # question_answer Which one of the following set of quantum numbers is not possible for 4p electron? A)  $n=4,\,l=1,\,m=-1,\,{{m}_{s}}=+\frac{1}{2}$B)  $n=4,\,l=1,\,m=0,\,{{m}_{s}}=+\frac{1}{2}$C)  $n=4,\,l=1,\,m=2,\,{{m}_{s}}=+\frac{1}{2}$D)  $n=4,\,l=1,\,m=-1,\,{{m}_{s}}=-\frac{1}{2}$

For 4P electron n = 4 $l=1$ $m=-1,0,+1$ ${{m}_{s}}=\pm \frac{1}{2}$ As $l=1,$m cannot be equal to 2. Therefore set (C) of quantum number is not possible.