The correct set of quantum numbers for the unpaired electron of chlorine atom is

Atomic No. of Chlorine,Cl, $Z=17$

Electronic configuration of Cl is $1{\text{s}}^{2}2{\text{s}}^{2}2{\text{p}}^{6}3{\text{s}}^{2}3{\text{p}}^5$.

The set of quantum numbers for the unpaired electron in chlorine is

$n=3,l=1,m_l=0$