Question

The correct set of quantum number for the unpaired electrons of chlorine atom is

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

Answer 1

Answer: (C)

The correct set of quantum numbers for the unpaired electron of a chlorine atom is $3,1,1, \pm \frac{1}{2}$.

For chlorine atom ( $Z =17)$, the last electron enters into $3 p$ orbital for which $n =3,1=1, m =-1,0$ or $+1$ and $s =\pm \frac{1}{2}$