The value of magnetic quantum number of the outermost electron of

$\mathrm{Zn}^{+} \rightarrow 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{1}$

Outermost electron is in $4 \mathrm{~s}$ subshell

$\mathrm{m}=0$