## Electron Spin

bonnie_schmitz_1F
Posts: 81
Joined: Fri Sep 28, 2018 12:24 am
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### Electron Spin

I'm a little confused about the idea of electron spin. Why do electrons spin and why is the quantum number associated with it +/- 1/2?

005115864
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

### Re: Electron Spin

Hi! Electron spins are similar to orientation except it's just the way an electron spins whether that be clockwise or counter clockwise! It's not really a value that can be changed it is just a property that was found of electrons upon observing them. If you recall, in the lecture, we discussed the Stern and Gerlach Experiment which discussed an experiment where it was observed, using a silver atom with 1 unpaired electron, that electrons can spin up (1/2) or down (-1/2) which is why we technically consider it the fourth quantum number.

Megan_Ervin_1F
Posts: 78
Joined: Fri Sep 28, 2018 12:18 am

### Re: Electron Spin

I believe you do not need to know the extreme details of spin. Just know that there is a fifty fifty chance of positive one half or negative one half and pick one when asked on a test

ran2000
Posts: 66
Joined: Fri Sep 28, 2018 12:15 am

### Re: Electron Spin

There is not much to be known for this course. In each orbital, 2 electrons can exist and they take up opposite spins. They take the values 1/2 and -1/2 since there's 50% chance of up spin and 50% chance of down spin.

kimberlyrose1G
Posts: 44
Joined: Fri Sep 28, 2018 12:27 am

### Re: Electron Spin

you can determine the electron spin by drawing the electron configuration, the details of the electron spin itself aren't essential but do provide a little background. Basically, if you draw the configuration, you'll have an arrow pointing up or down in the end, so this will tell you whether it is +1/2 (spin up) or -1/2 (spin down).

Andrew Bennecke
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

### Re: Electron Spin

I don't know if this is correct, but I believe that the first electron spins up, while the second spins down. I am basing this off of when we draw our electron configurations, we draw the first electron as an arrow pointing up in each orbital.

404905747
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

### Re: Electron Spin

I am a little confused as well. I understand how you fill the orbitals and their spin. I just don’t understand why.

Zachary Menz 1D
Posts: 32
Joined: Wed Nov 07, 2018 12:17 am

### Re: Electron Spin

Electron spin represents the angular momentum of electrons, and is noticeable when electrons interact with magnetic fields. In each individual orbital, there is one electron with a +1/2 spin and one electron with a -1/2 spin.