The set of quantum numbers not applicable for an electron in an atom is

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n=1, l=1, m=1, s=+1/2

n=1, l=0, m=0, s=+1/2

n=1, l=0, m=0, s=−1/2

n=2, l=0, m=0, s=+1/2

answer is A.

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Detailed Solution

For a given value of ‘n’ , l=(n-1)Hence n may not be equals to ln=1, 1=1, m=1, s=+1/2 is not possible