## Spins

Ahmet_Dikyurt_3L
Posts: 35
Joined: Fri Sep 28, 2018 12:23 am

### Spins

Can someone explain spin ups and downs? And how they’re represented?

Kailey Nichols 4B
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

### Re: Spins

Spin up and spin down is just a way to describe the electron's angular momentum (it does not mean that the electrons actually spin in place). Spin up corresponds to an ms value of 1/2 and spin down corresponds -1/2. The spin values won't be written directly in the electron configuration notation, however if you're given something like 1s^2 2s^2 2px^1 2py^1 then we know that the last two electrons are parallel and thus both spin up.

marisaimbroane1J
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

### Re: Spins

The spin values can also help determine electron configurations because of the rules discussed in class. It's important to always fill the subshell with one spin first then add the other spin when you fill the shell.

Searra Harding 4I
Posts: 68
Joined: Fri Sep 28, 2018 12:29 am

### Re: Spins

When drawing electron configuration models, another thing to remember is that the electrons are parallel first. This means that there will be an upward arrow in each line drawn before you start pairing them with downward facing arrows.

Sophie Roberts 1E
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

### Re: Spins

In addition to the all the previous replies, spin up and spin down is referenced when an atom has unpaired electrons (it subshells aren't filled).