For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply.

( ) n=2, l=0, ml=0, ms=+1/2
( ) n=1, l=0, ml=0, ms=+1/2
( ) n=2, l=1, ml=0, ms=-1/2
( ) n=2, l=1, ml=1, ms=+1/2
( ) n=2, l=0, ml=0, ms=-1
( ) n=2, l=0, ml=0, ms=-1/2
( ) n=1, l=0, ml=-1, ms=+1/2
( ) n=1, l=0, ml=0, ms=-1/2

4 answers

You have 4 electrons in Be. The configuration is 1s2 2s2.
For the two outside electrons n = 2, s electrons have l = 0 so you are looking at
n = 2, l=0, ms = +1/2 and -1/2

You do the two inside electrons the same way but of course n = 1.

Thanks.

lop