Which the following sets of quantum numbers is not allowed, Chemistry

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Which of the following sets of quantum numbers is not allowed :

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

(2) n=1, l=1,m=0 s= -1/2             

(3) n=2, l=1,m=1 s= +1/2 

(4) n=2, l=1,m=0 s= -1/2

Ans: n=1, l=1,m=0 s= -1/2

 


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