\(1{s^2}\,2{s^2}\,2{p^6}\,3{s^2}\,3{p^6}\,3{d^{10}}\,4{s^2}\,4{p^6}\,5{s^1}\)
So for the valence shell electron \((5{s^1})\)
\(n = 5,\,l = 0,\,m = 0,\,s = + \frac{1}{2}\)
$n$ $l$ $m$ $s$
$A.$ $n =3, l =0, m =0$
$B.$ $n =4, l =0, m =0$
$C.$ $n =3, l =1, m =0$
$D.$ $n =3, l =2, m =1$
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