Atomic Structure Question 228

Question: The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is

Options:

A) $ n=2,,l=1,,m=-1,,s=-\frac{1}{2} $

B) $ n=3,,l=0,,m=0,,s=+\frac{1}{2} $

C) $ n=3,,l=2,,m=-2,,s=-\frac{1}{2} $

D) $ n=3,,l=2,,m=2,,s=+\frac{1}{2} $

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Answer:

Correct Answer: B

Solution:

$ Na_{11}=2,,8,,1 $

$ =1s^{2},,2s^{2},2p^{6},3s^{1} $

$ n=3,,l=0,,m=0,s=+1/2 $



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