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Q.

Which of the following quantum numbers are correct for the outermost electron of sodium atom? 

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a

n=4,l=0,m=0,s=+1/2

b

n=3,l=2,m=−1,s=−1/2

c

n=3,l=0,m=0,s=−1/2

d

n=3,l=1,m=+1,s=+1/2

answer is B.

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Detailed Solution

 11Na=1s22s22p63s1
For 3s1,n=3,l=0,ml=0,s=−1/2

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