Destroyer Q

[flossit]

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Consider valence electron of Na. What is its quantum numbers?
The correct is : 3,0,0,1/2
Why not: 3,2,0,1/2 or not 3,1,0,1/2

 

[emj007]

the second number (L- the orbital quantum number) describes the type of orbital. They are assigned as 0-s, 1-p, 2-d, 3-f etc...
So for Na, it falls under the S orbital, therefore L must be 0.

 

[flossit]

the second number (L- the orbital quantum number) describes the type of orbital. They are assigned as 0-s, 1-p, 2-d, 3-f etc...
So for Na, it falls under the S orbital, therefore L must be 0.

Thank you!

 

[super frank]

The second number (azimuthal/angular momentum quantum number) tells you which subshell you're in. Since Na is 3s1, it is in the s sub-shell (which has only one orbital). The third number describes which orbital you take up in the sub-shell (thereby telling you the spatial orientation of the electron). Since the s-subshell only has one orbital then the electron can only reside in this orbital. However, if targetting an electron in the p sub-shell of a Cl (l = 1), then the electron can reside in any of the three orbitals present in p (-1, 0, or 1).