# quantum numbers

#### SpikeyMike83

##### Senior Member
10+ Year Member
7+ Year Member
so the magnetic quantum number ranges from
-l --> +l

But do we need to know, for example, specifically what the ml for Sulfur is? Or just knowt that because Sulfur is "p", it can be -1,0,1?

If there is a way to tell which one of those it is most often, how do you do it? i'm going crazy over this!

#### GRAD

##### Member
10+ Year Member
yeah just need to know it for different groups eg s, p, d, f

if they ask you for how many electrons in l=3
its 4l+2

if they ask you how many electrons in n=2
its 2n^2= 8

Just remember those, and also know that sis when l=0
p is when ml is -1--->1 thats three subshells 3*2=6 electrons
f is when l is from -3--->3 thats 14 electrons, etc

if they ask for sulfur, which i dont think they will cause then you have the number of electrons right in front of you.

quantum numbers are used to describe any electron, but i dont think you can determine it the opposite way. if you look at sulfur, you see that it has - electrons, so you would know the spin, and you would know if its paramagnetic, etc. I doubt they would ask you to find ml for sulfur

#### SpikeyMike83

##### Senior Member
10+ Year Member
7+ Year Member
thanks!

I just was using sulfur as an example because me and my mom were trying to figure it out. I'm fine with knowing all of what you said, I just know that the magnetic quantum number determines where the electron is most likely to be found and so I didn't know if they'd ask you to pinpoint a specific value... or just know that if you're dealing with p, it could be -l --> l

I'm guessing they'd probably give you some quantum numbers and ask which could be correct for a certain element.

#### GRAD

##### Member
10+ Year Member
From what ive seen, they'll give you forinstance n, and have you determine l, or give you l and have you determine ml, etc, stuff like that, relating the numbers together....or finding # electrons...

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