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Chem

what are the four quantum numbers of the last electron of As

this is what i have
n=4
l=1
ms= 1/2

i don't know how to calculate ml. I know it's either: -1,0,1

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  1. Here is a site that gives the electron configuration showing
    3d10 4s2 4p3.
    Thus for the last electron, that will be the one that is 4p and I usually fill the -1, then 0, then +1 for ml. You are correct on n, ms and and l.

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  2. so it will be 1 as the last electron comes on that one correct?
    umm and i don't see the link you posted :S

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  3. You didn't see it because I didn't post it. Sorry about that.
    http://www.webelements.com/arsenic/atoms.html
    Yes, 1 for ml is what I would do.

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