Gen Chem question

[i4everpaki]

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Barium is an alkaline earth metal with the atomic number 56. which set of quantum numbers may be written for a valence electron of barium?

1) n=6, l=1, m=1, ms= +1/2
2) n=6, l=0, m=0, ms=+1/2
3)n=6, l=0, m=1, ms=+1/2
4)n=6, l=2, m=2, ms=+1/2
5) n=6, l=2, m=1, ms=+1/2

i can't seem to figure out magnetic quantum number!
i know n=6 bc its the 6 row, and l=0 since its S subshell, the spin should be +1/2 since its positive. how are you we suppose to figure out m. i know m is + or - l. so how do we figure out m in this problem or any other example.

 

[luv8724]

It's 0 because l is 0.. Isn't it?

-l<0<+l so m(s) = 0 answer is 2 i believe.

 

[i4everpaki]

now what would be the case of l = 1? then its -1 , 0 , 1.. how do we choose from those like what would be the quatum number for Al, Si, P, S, Cl, and Ar
n=2, l=1, m=?, ms= -1/2

and yes luv8724 you did got it right.

 

[luv8724]

now what would be the case of l = 1? then its -1 , 0 , 1.. how do we choose from those like what would be the quatum number for Al, Si, P, S, Cl, and Ar
n=2, l=1, m=?, ms= -1/2

and yes luv8724 you did got it right.

I'm going to tell you how I understand..
For Hund's rule, it says that you are suppose to fill all the shells before filling the opposite spins right?

m(s) with -1 is p(x) orbital 0 is p👍 orbital and +1 is p(z) orbital.

so for Al, You are going to have -1 and +1/2 it's in p(x) and the arrow is upward. Si would be 0 and +1/2; P would be +1 and +1/2; S would be -1 and -1/2; Cl would be 0 and -1/2; and Ar would be +1 and -1/2

I hope this helps...

oh ****... now Im confused.. then how does Ba have positive spin in the question... or is it a typo lol

 

[i4everpaki]

i think i understand it now. except the spin part thats a little confusing but i doubt they will go in to extreme details. thanks alot.