## Electron structures

Marty Hockey
Posts: 47
Joined: Wed Sep 18, 2019 12:19 am

### Electron structures

When filling the spins of electrons in a problem, for example filling the p shell, does it matter which spaces have arrows first? I know that you have to fill the 3 spaces before being allowed to add a second arrow, but does it matter which space you would put the 4th arrow in?

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

### Re: Electron structures

I don't believe the order necessarily matters, but I think it's more convenient to fill them in order. However, it is important to know that according to Hund's rule, every orbital in a subshell must have at least one electron before an orbital can have two electrons.

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

### Re: Electron structures

I think that it does matter which orbital you put the 4th arrow in to indicate to the grader that you understand the concept of orbitals. One orbital must be filled before the next can be filled (this being after there is one arrow in each orbital), so it would make sense to put the 4th arrow in the first space.