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# Which of the following is not permissible arrangement of electrons in an atom ?

$\begin{array}{1 1} (a)\;n=4,I=0,m=0,s=-\large\frac{1}{2} \\ (b)\;n=5,I=3,m=0,s=+\large\frac{1}{2} \\ (c)\;n=3,I=2,m=3,s=-\large\frac{1}{2} \\ (d)\;n=3,I=2,m=2,s=\large\frac{1}{2} \end{array}$

For an electron may be 0,1,2 .......... and I=0 to n=1 and m=-1 to 0 and $\pm 1/2$
$I=0 \;to\;(3-1)$
$\qquad= 0,1,2,$
$m=1 to +1$
$\qquad= -2,-1,0,+1,+2$