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  4. The magnetic quantum number of valence electron of sodium (Na) is:

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Q. The magnetic quantum number of valence electron of sodium $ (Na) $ is:

Rajasthan PMTRajasthan PMT 2002The s-Block Elements

Solution:

Na (atomic number $=11$ )
$=1 s^{2}, 2 s^{2} \,2 p^{6}, 3 s^{1}$
For $3 s^{1}, n=3, l=0$ and $m=0$