Achiever Test 2 Question

[YoonS]

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On chem section,

How many e- belong to an atom of Al are associated with the azimuthal
quantum number (l=1) under ground state condition?

and I answered 6, but the answer was 7.

The explanation was saying something blah blah that I reall cant understand and 6+1 = 7 something like that.

Can someone explain this for me??

 

[jhanago]

First off, why did you pick 6?

 

[dantemac]

The configuration has the 2p block (remember, l = p block e-) full with 6 electrons and the 3p block as 1 electron.

This is not Al3+ or anything, so neutral Al(s) has 6 + 1 = 7 p-block (l) electrons.

 

[Kobebucsfan]

1s2 - 2s2 - 2p6 - 3s2 - 3p1


6+1=7


s=0
p=1
d=2