## electron spin arrows

Katherine Chhen 3I
Posts: 53
Joined: Fri Sep 28, 2018 12:15 am

### electron spin arrows

How would we know if an electron is paired or parallel within a shell?

Alexis Webb 2B
Posts: 124
Joined: Thu Jul 11, 2019 12:15 am

### Re: electron spin arrows

It depends on the number of electrons. Say you go into an energy level with three orbitals, and you only have two electrons left. You would put one electron of spin up in one orbital and then another electron of spin up in the second orbital, and these would be parallel. If you had 6 electrons left to fill these three orbitals, then you would fill each orbital with a spin up electron and go back and fill each with a spin down electron, and then each of these electrons would be paired because there are two in each orbital of different spin.

Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

### Re: electron spin arrows

I think it helps to draw the electrons out as arrows on available orbitals, and make sure to fill up all the orbitals with one arrow before parting them up.

SMIYAZAKI_1B
Posts: 63
Joined: Sat Aug 24, 2019 12:15 am

### Re: electron spin arrows

According to the Hund's rule, it is said that we have to fill one into each sub shell of the orbital before doubling any of the sub shell with electrons. Therefore, in each of the sub shells, you cannot have an opposite spin of the electrons until each sub shell are filled with parallel spinning electrons.

Megan Cao 1I
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

### Re: electron spin arrows

electrons like to be parallel before they are paired--think of them as introverts when you're drawing the spins. drawing them out helps you understand wether they're paired or not

Natalie C 1K
Posts: 50
Joined: Wed Sep 18, 2019 12:16 am
Been upvoted: 1 time

### Re: electron spin arrows

electrons have a negative charge, so they like to be as far away from each other as possible. This is why Hund's Rule states that electrons have to be parallel, and in separate orbitals, before they are paired in the same orbital.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

### Re: electron spin arrows

When you are drawing the spin diagrams, the electrons are paired if there are two arrows in the same orbital. Electrons are parallel if the spin arrows face the same direction but are in different orbitals in the same subshell.