Question

A set of quantum numbers are given for paired electrons or for one electron in an orbital. Assuming n values are correct, the incorrect set of quantum numbers are:

• A. $1,0,0,+1/2,-1/2$
• B. $2,2,1,\pm 1/2$
• C. $3,0,-1,-1/2$
• D. $2,1,-1,0$

Answer 1

Answer: (B), (C), (D)

$3,0,-1,-1/2$
$2,1,-1,0$
$2,2,1,\pm 1/2$

The set of quantum numbers are $n,l,m$ and $s$

where, $n=1,2,3,.....$

$l=n-1$

$m=2l+1$ and $m$ varies from $-l$ to $+l$

$s=+\frac{1}{2}$ or $-\frac{1}{2}$

The correct set of quantum numbers are:
$A.1,0,0,\pm \frac{1}{2}$
$B.2,1,1,\pm \frac{1}{2}$ ( $l$ should less than $n$ )
$C.3,0,0,-\frac{1}{2}$ (m value cannot be -1 it will be 0 for l=0)
$D.2,1,-1,+\frac{1}{2}$ (Spin can't be zero)