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 $
