$1{s^2}\,2{s^2}\,2{p^6}\,3{s^2}\,3{p^6}\,3{d^{10}}\,4{s^2}\,4{p^6}\,5{s^1}$
So for the valence shell electron $(5{s^1})$
$n = 5,\,l = 0,\,m = 0,\,s = + \frac{1}{2}$
$(m= 9.1 \times 10^{-31}\, kg , h =6.6 \times 10^{-34} \,kg\, m^2s^{-1},)$