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Which set of quantum numbers for an electron of an atom is not possible:
(1) n=1 l=0, m=-0, s= +1/2
(2) n=1, l=1, m=-1, s= +1/2
(3) n=1, l=0, m=0, s= -1/2
(4) n=2 l=1, m=-1, s= +1/2
Ans: n=1, l=1, m=-1, s= +1/2
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