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The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is:
(1) n =1, l= 1, m= -1, s= -1/2
(2) n =3, l=0, m=0, s= +1/2
(3) n =3, l= 2, m= -2, s= -1/2
(4) n =3, l= 2, m= 2, s= +1/2
Ans: n =3, l=0, m=0, s= +1/2
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