## n, l ,ml, ms

Abigail Menchaca_1H
Posts: 104
Joined: Sat Sep 07, 2019 12:19 am

### n, l ,ml, ms

I am confused on what to write for ms = ... I am not sure if we are supposed to pick -1/2, +1/2 or both or just how we get an answer for it

christabellej 1F
Posts: 109
Joined: Sat Aug 17, 2019 12:17 am

### Re: n, l ,ml, ms

The magnetic spin of an electron can only be +1/2 or -1/2. This is because of the Pauli exclusion principle where there can only be two electrons per orbital, and that the electrons must be spin paired. So, one electron must go in an upwards spin (+1/2) and the other in a downwards spin (-1/2). As far as writing them out, you can choose to write either +1/2 or -1/2 as it doesn't really matter.

Eva Zhao 4I
Posts: 101
Joined: Sun Sep 29, 2019 12:16 am

### Re: n, l ,ml, ms

As mentioned, ms can be either +1/2 or -1/2, and it's pretty arbitrary unless the question specifically provides the spin. The most important thing to note is that no two electrons in the same atom can have the exact same four quantum numbers.

Eunice Nguyen 4I
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

### Re: n, l ,ml, ms

It doesn't really matter which one you pick necessarily, as long as they are opposite spins. So you can't have two +1/2 together, but rather one +1/2 and one -1/2.

ThomasNguyen_Dis1H
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

### Re: n, l ,ml, ms

ms can only equal +/- 1/2. Each electron in the orbital can only take one of the values. For example, in a Pz orbital, two electrons can be in this orbital. These electrons can't have the same ms values so one must be +1/2 and one must be -1/2.

quresh3E
Posts: 36
Joined: Wed Sep 18, 2019 12:17 am

### Re: n, l ,ml, ms

If you write the electron configuration you can tell if there is a +1/2 or -1/2 spin.

Ashley Kim 3F
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

### Re: n, l ,ml, ms

As everyone above mentioned, the only two possible values for ms are +½ and -½. In a quiz or test, the spin of the electron will most likely be easy to determine given the wording or information provided in the question, so I don't think you need to worry about it too much!

105289321
Posts: 49
Joined: Sat Sep 07, 2019 12:15 am

### Re: n, l ,ml, ms

It is either +1/2 or -1/2 depending on the spin of the valence electron in question

Annie Ye
Posts: 106
Joined: Wed Sep 18, 2019 12:22 am

### Re: n, l ,ml, ms

When the spin is up, the ms is +1/2 and when the spin is down it is -1/2

Posts: 106
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

### Re: n, l ,ml, ms

Spin up is +1/2
Spin down is -1/2

Anokhi Patel 2B
Posts: 76
Joined: Fri Aug 09, 2019 12:17 am

### Re: n, l ,ml, ms

Up spin is +1/2 and down spin -1/2

Gerald Bernal1I
Posts: 102
Joined: Thu Jul 11, 2019 12:16 am

### Re: n, l ,ml, ms

When asked to write the ms of a certain configuration you just have to pick one of them since each refers to one electron spinning one way. Since there is no definite way to know you can pick one, +1/2 being up spin and -1/2 being down spin.

Claire Grover 3G
Posts: 64
Joined: Wed Sep 18, 2019 12:18 am

### Re: n, l ,ml, ms

I think it depends on which direction the electron is going (either up or down).

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

### Re: n, l ,ml, ms

ms tells you if the electron is spin up or spin down. If it is the first time filling the orbital it is spin up. If you need to pair an electron it will be spin down.