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The four quantum numbers of the outermost orbital of K (atomic no. =19) are:
(1) n= 2, l= 0, m=0, s= +1/2
(2) n= 4, l= 0, m=0, s= +1/2
(3) n= 3, l= 1, m=1, s= +1/2
(4)n= 4, l= 2, m=-1 s= +1/2
Ans: n= 4, l= 0, m=0, s= +1/2
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