Chemistry
posted by Anonymous .
For each electron in a groundstate Be atom, select the set of quantum numbers that represents it. Check all that apply.
n=1 l=0 ml=1 ms= +1/2
n=1 l=0 ml=0 ms=1/2
n=2 l=1 ml=0 ms= 1/2
n=1 l=0 ml=0 ms=+1/2
n=2 l=1 ml=1 ms=+1/2
n=2 1=0 ml=0 ms=+1/2
n=2 l=0 ml=0 ms=1/2
n=2 l=0 ml=0 ms=1
I know the top one and the last one aren't correct but I don't know about the others. The hint said,"Make sure you have chosen exactly four answers" why will it have 4?

Chemistry 
DrBob222
There are four electrons, right? So there must be four answers.
#1 electron:
n = 1
l = 0
ml = 0
ms = +1/2
#2 electron:
n = 1
l = 0
ml = 0
ms = 1/2
That's two of them.
#3 electron:
n = 1
l = 0 or 1
ml = etc
All you really need to do is to fill in the blanks as the electrons are added. I've done the two n= 1 electrons, There are now two n = 2 electrons and another hint: l = 0 fills up first.
You're right about the top one and last one not being right.
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